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  • enable email on Godaddy when using Zerigo on Heroku hosted app

    - by joelmaranhao
    A little recap of what I have done ... and then my questions Q1, Q2 and Q3 1 - I developed a RoR app that I deployed on Heroku. biowatts.heroku.com 2 - I bought a domain name at GoDaddy: biowattsonline.com 3 - I am using Zerigo addon as for the DNS heroku addons:add custom_domains heroku addons:add zerigo_dns:basic 4 - Added my domains in Heroku heroku domains:add biowattsonline.com heroku domains:add www.biowattsonline.com and subdomains heroku domains:add calculator.biowattsonline.com Q1: Where do we configure the forward to http://biowattsonline.com/biogas_calculator ? 5 - Configured GoDaddy adding the Zerigo domains In the Nameservers section a.ns.zerigo.net b.ns.zerigo.net c.ns.zerigo.net d.ns.zerigo.net e.ns.zerigo.net The GoDaddy DNS section is empty: "Not hosted here" Ok this works all fine ... http://biowattsonline.com is correctly found 6 - Subdomain forward I want calculator.biowattsonline.com to be forwarded to biowattsonline.com/biogas_calculator Q2: So I created the forward in GoDaddy ... but is that correct? 7 - GoDaddy email Q3: I have one free email account with go GoDaddy, only now that I am using Zerigo I don't know how configure GoDaddy to make it work again?... because it work with the default values Any ideason Q1, Q2 and Q3? Thanks, Joel

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  • SQL SERVER – Puzzle to Win Print Book – Write T-SQL Self Join Without Using FIRST _VALUE and LAST_VALUE

    - by pinaldave
    Last week we asked a puzzle SQL SERVER – Puzzle to Win Print Book – Functions FIRST_VALUE and LAST_VALUE with OVER clause and ORDER BY . This puzzle got very interesting participation. The details of the winner is listed here. In this puzzle we received two very important feedback. This puzzle cleared the concepts of First_Value and Last_Value to the participants. As this was based on SQL Server 2012 many could not participate it as they have yet not installed SQL Server 2012. I really appreciate the feedback of user and decided to come up something as fun and helps learn new feature of SQL Server 2012. Please read yesterday’s blog post SQL SERVER – Introduction to LEAD and LAG – Analytic Functions Introduced in SQL Server 2012 before continuing this puzzle as it is based on yesterday’s post. Yesterday I ran following query which uses functions LEAD and LAG. USE AdventureWorks GO SELECT s.SalesOrderID,s.SalesOrderDetailID,s.OrderQty, FIRST_VALUE(SalesOrderDetailID) OVER (ORDER BY SalesOrderDetailID) FstValue, LAST_VALUE(SalesOrderDetailID) OVER (ORDER BY SalesOrderDetailID) LstValue FROM Sales.SalesOrderDetail s WHERE SalesOrderID IN (43670, 43669, 43667, 43663) ORDER BY s.SalesOrderID,s.SalesOrderDetailID,s.OrderQty GO The above query will give us the following result: Puzzle: Now use T-SQL Self Join where same table is joined to itself and get the same result without using LEAD or LAG functions. Hint: Introduction to JOINs – Basic of JOINs Self Join A new analytic functions in SQL Server Denali CTP3 – LEAD() and LAG() Rules Leave a comment with your detailed answer by Nov 21's blog post. Open world-wide (where Amazon ships books) If you blog about puzzle’s solution and if you win, you win additional surprise gift as well. Prizes Print copy of my new book SQL Server Interview Questions Amazon|Flipkart If you already have this book, you can opt for any of my other books SQL Wait Stats [Amazon|Flipkart|Kindle] and SQL Programming [Amazon|Flipkart|Kindle]. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Function, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Webfarm and IIS configuration tips/tricks

    - by steve schofield
    I was recently talking with some good friends about tips for performance and what an IIS Administrator could do on the server side.  I also see this question from time to time in the forums @ http://forums.iis.net.    Of course, you should test individual settings in a controlled environment while performing load testing before just implementing on your production farm.  IIS Compression enabled (both static and dynamic if possible, set it to 9)  If you are running IIS 6, check this article out by Scott Forsyth. Run FRT for long running pages (Failed Request Tracing) Sql Connection pooling in code Look at using PAL with performance counters ( http://blogs.iis.net/ganekar/archive/2009/08/12/pal-performance-analyzer-with-iis.aspx )  Look at load testing using visual studio load testing tools Log parser finding long running pages.  Here is a couple examples Look at CPU, Memory and disk counters.  Make sure the server has enough resources. Same machineKey account across all same nodes Localize content vs. using UNC based content on a single server (My UNC tag with great posts) Content expiration ETAG’s the same across all web-farms Disable Scalable Networking Pack Use YSlow or Developer tools in Chrome to help measure the client experience improvements. Additionally, some basic counters in for measuring applications is: I would recommend checking out the Chapter 17 in IIS 7 Resource kit. it was one of the chapters I authored. :) Concurrent Connections,  Request Per / Sec, Request Queued.  I strongly suggest testing one change at a time to see how it helps improve your performance.  Hopefully this post provides a few options to review in your environment.   Cheers, Steve SchofieldMicrosoft MVP - IIS

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  • CodePlex Daily Summary for Thursday, May 27, 2010

    CodePlex Daily Summary for Thursday, May 27, 2010New ProjectsBinding Navigator: Clone of WinForms BindingNavigator that is able to work with any type of DataSource. For full functionality it requires the DataSource to implement...DEWD: DEWD is an Umbraco 4.0 extension used to edit sequential data such as rows in a SQL server database table. It's meant to allow developers to quickl...Eletronic Invoice Extensions: A simple DLL to use against XSD and validate a XML.EssionCalendar: EssionCal EssionCalExpression Encoder Batch Processor: Importing your videotapes into Windows is easy with the built-in utilities, but if your importer does not encode to your desired format, you need t...Feedback Form: Feedback application makes it easier for attendees who attend an seminar/event and event organizers. Organizers of the event will no longer need to...Find in Start Menu: Find in Start MenuIE8 Web Slices Pack: IE8 Web Slices Pack is a package of 5 types of web slices ready to be customized via a mini-CMS for your web site or for your custom IE8 installer....KafTK: Iskakov AzamatMicrosoft Dynamics NAV text export splitter: Utility for splitting Microsoft Dynamics NAV object exports (in text format) into files that each contain a single object. MultiPoint Vote: Voting is more innovative and catchy through this MultiPoint application. Using MultiPoint SDK 1.5 and Visual C#, this prototype emphasizes the cap...NebDotNet: NebDotNetnsim: Some simulation issues.OpenLight Group Common Lib: This project is a set of classes commonly used across OpenLight Group projects.pstsdk.net: .NET port of PST File Format SDK: pstsdk.net makes it easier for .NET developers to access the PST file format. This is a direct C# port of the PST File Format SDK project which is ...RavenMVC: A NoSQL Demo App using RavenDB and ASP.NET MVC 2.Remics: Remics is a toolkit for reverse engineering tools. Open source (MIT license). The goal of Remics is enabling developers (or researchers) quickly...RIA Services to Legacy DAL Integration Library: RIA Services to Legacy DAL Integration LibrarySharePoint List Adapters for SSIS: SSIS source and destination components to access SharePoint lists using basic authenticationSql Query Modelling Language: This project library creates simple Sql queries.Thumb nail creator and image resizer: a user control to create thubnails and resize images for displayTK: study projectViperWorks Ignition: Ignition is application framework for WinForms and WPF business applications. Built in webservice generation, reporting and rapid application devel...XNA Image Reflector: XNA Image Reflector allows you to add Web 2.0-like reflections to images in a few clicksXNArkanoid: XNArkanoid is a Windows Phone 7 remake of the classic Taito´s Arkanoid. It´s developed in C#, using XNA Framework v4.0.New ReleasesAcies: Acies - Alpha Build 0.0.5: First alpha release. Requires Microsoft XNA Framework Redistributable 3.1 (http://www.microsoft.com/downloads/details.aspx?FamilyID=53867a2a-e249...Ajax Toolkit for ASP.NET MVC: Ajax Toolkit for ASP.NET MVC v20100527: change array datasource to json datasource allow lowercaseAttribute Builder: Attribute Builder 1.0: Attribute Builder 1.0Support for parameter-less constructors, constructors with parameters and object initialization with field and property assign...Binding Navigator: TTBindingNavigator preview: First binary release. Only control without samples.Bojinx: Bojinx Core V4.5.15: Bugs fixed: Clean up in the event handler Added more disposal features to better clean up contexts on unload. Optimized command processing fur...CBM-Command: Version 1.0 - 2010-05-26: Release Notes - 2010-05-26 - Version 1.0New Features None Changes Fixed bug where you could move to an unopened panel Fixed bug where you could ...Community Forums NNTP bridge: Community Forums NNTP Bridge V03: This is the second release of the Community Forums NNTP Bridge to access the social and anwsers MS forums with a single, open sourcen NNTP Bridge. ...Community Forums NNTP bridge: Community Forums NNTP Bridge V04: This is the second release of the Community Forums NNTP Bridge to access the social and anwsers MS forums with a single, open sourcen NNTP Bridge. ...Community Forums NNTP bridge: Community Forums NNTP Bridge V05: This is the second release of the Community Forums NNTP Bridge to access the social and anwsers MS forums with a single, open sourcen NNTP Bridge. ...Community Forums NNTP bridge: Community Forums NNTP Bridge V06: This is the second release of the Community Forums NNTP Bridge to access the social and anwsers MS forums with a single, open sourcen NNTP Bridge. ...Community Forums NNTP bridge: Community Forums NNTP Bridge V07: Release of the Community Forums NNTP Bridge to access the social and anwsers MS forums with a single, open sourcen NNTP Bridge. This release solves...Community Forums NNTP bridge: Community Forums NNTP Bridge V08: Release of the Community Forums NNTP Bridge to access the social and anwsers MS forums with a single, open source NNTP bridge. This release solves ...Dot Game: Dot Game Network version: Now, you can play over network.EpsiRisk: EPSI RISK V1: First Stable Version of EpsiRISK ! Enjoy !Event Scavenger: Viewer 3.3.0: Added grouping functionality to Viewer. Group expanding/collapsing only supported under Windows Vista/7 and onwards. Viewer version set to 3.3.0.FAST for Sharepoint MOSS 2010 Query Tool: Version 1.0: Full Release Added sorting Added custom trim duplicates Added UI improvements Added ignore certificate errorsFoursquare for Windows Phone 7: Foursquare 2010.05.26.01: Foursquare 2010.05.26.01 Updates: Corrected issue with isPrivate, sendToTwitter, and sendToFacebookHobbyBrew Mobile: Beta 3: ATTENZIONE notifica nuove versioni via email disponibile (leggi in fondo)! Supporto alla rotazione dello schermo: Malti e Luppoli si affiancano or...IE8 Web Slices Pack: IE8 Web Slices Pack v2.0: This release of the Web Slices Pack supports 5 different Web Slices and a mini CMS to administer the info in the Web Slices.manx: manx data 1.0: Initial dump of data. This is a raw SQL dump script that deletes all existing data and inserts the initial dataset as received from Paul Williams....Microsoft Web Protection Library: WPL May CTP: This preview of the Web Protection Library includes AntiXSS - an updated Anti-Cross Site Scripting Library removes some bugs and is now usable in ...MultiPoint Vote: MultiPoint Vote v.1: MultiPoint Vote v1 Features This accepts user inputs: number of participants, poll/survey title and the list of options A text file containing th...NLog - Advanced .NET Logging: Nightly Build 2010.05.26.001: Changes since the last build:2010-05-25 19:21:49 Jarek Kowalski Reordered parameters of AsynchronousAction<T> 2010-05-25 19:16:02 Jarek Kowalski N...NodeXL: Network Overview, Discovery and Exploration for Excel: NodeXL Class Libraries, version 1.0.1.124: The NodeXL class libraries can be used to display network graphs in .NET applications. To include a NodeXL network graph in a WPF desktop or Windo...NodeXL: Network Overview, Discovery and Exploration for Excel: NodeXL Excel 2007 Template, version 1.0.1.124: The NodeXL Excel 2007 template displays a network graph using edge and vertex lists stored in an Excel 2007 workbook. What's NewThis is a minor re...OpenExpressApp let business people build application: OpenExpressApp for .Net4: 从.Net3.5 SP1 升级到.Net4 ,升级主要内容: 1. 解决了一些内存泄露问题 2. 修改了一些bug 3. 进行了部分代码重构 4. 使用MEF替代了PrismRavenMVC: RavenMVC 0.1: A NoSQL demo app in ASP.NET MVC using RavenDB.SharePoint List Adapters for SSIS: Initial Release: Contains the raw assemblies necessary to use the SharePoint list adapters with basic authentication. See the read me file for details on using in ...Sql Query Modelling Language: Sql Qml V1: This is first versionThumb nail creator and image resizer: ThumbnailCreator 1.0: This is the very first release I built it for my self so it a bit rough but i thought others might fint it usefulluptime.exe: uptime.exe v1.1: Changed the calculation of the uptime. It's now based on the LastbootUpTime value obtained from WMI.VCC: Latest build, v2.1.30526.0: Automatic drop of latest buildViperWorks Ignition: Test: TestXmlCodeEditor: Release 0.91 Alpha: Release 0.91 AlphaXNA Image Reflector: XNA Image Reflector v 1.1: This release has been compiled with XNA Game Studio 3.1, so you will need to download the XNA Runtime 3.1 in order to run it.Xna.Extend: Xna Extend (Ver 0.0.1 beta): This is the betas, betas, beta, test version (Version 0.0.1 beta). It includes only the input and audio components. If you experience any errors, o...XNArkanoid: XNArkanoid v 0.2b: XNArkanoid v 0.2. Initial beta releaseMost Popular ProjectsRawrWBFS ManagerAJAX Control ToolkitMicrosoft SQL Server Product Samples: DatabaseSilverlight ToolkitWindows Presentation Foundation (WPF)patterns & practices – Enterprise LibraryMicrosoft SQL Server Community & SamplesPHPExcelASP.NETMost Active ProjectsAStar.netpatterns & practices – Enterprise Librarypatterns & practices: Windows Azure Security GuidanceSqlServerExtensionsMono.AddinsBlogEngine.NETCustomer Portal Accelerator for Microsoft Dynamics CRMRawrCodeReviewGMap.NET - Great Maps for Windows Forms & Presentation

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  • CodePlex Daily Summary for Monday, April 26, 2010

    CodePlex Daily Summary for Monday, April 26, 2010New Projects.Net 4.0 WPF Twitter Client: A .Net 4.0 Twitter client application built in WPF using PrismAop 权限管理 license授权: 授权管理 Aop应用asp.mvc example with ajax: asp.mvc example with ajaxBojinx: Flex 4 Framework and Management utilities IOC Container Flexible and powerful event management and handling Create your own Processors and Annotat...Browser Gallese: Il Browser Gallese serve per andare in internet quasi SICURO e GratiseaaCaletti: 2. Semester project @ ÅrhusEnki Char 2 BIN: A program that converts characters to binary and vice versaFsGame: A wrapper over xna to improve its usage from F#jouba Images Converter: Convert piles of images to all key formats at one go! Make quick adjustments - resize, rotate. Get your pictures ready to be printed or uploaded to...MVC2 RESTful Library: A RESTFul Library using ASP.NET MVC 2.0My Schedule Tool: Schedule can be used to create simple or complex schedules for executing tens. NAntDefineTasks: NAnt Define Tasks allows you to define NAnt tasks in terms of other NAnt tasks, instead of having to write any C# code. PowerShell Admin Modules: PAM supplies a number of PowerShell modules satisfying the needs of Windows administrators. By pulling together functions for adminsitering files a...Search Youtube Direct: Another project By URPROB This is a sample application that take search videos from youtube. The videos are shown with different attributes catagor...Simple Site Template: Simple Site Template 一个为了方便网站项目框架模板~Slaff's demo project: this is my demo projectSSIS Credit Card Number Validator 08 (CCNV08): Credit Card Number Validator 08 (CCNV08) is a Custom SSIS Data Flow Transformation Component for SQL Server 2008 that determines whether the given ...Su-Lekhan: Su-Lekhan is lite weight source code editor with refactoring support which is extensible to multiple languagesV-Data: V-Data es una herramienta de calidad de datos (Data Quality) que mejora considerablemente la calidad de la información disponible en cualquier sist...zy26: zy26 was here...New ReleasesActive Directory User Properties Change: Source Code v 1.0: Full Source Code + Database Creation SQL Script You need to change some values in web.config and DataAccess.vb. Hope you will get the most benefit!!Bojinx: Bojinx Core V4.5: V 4.5 Stable buildBrowser Gallese: Browser 1.0.0.9: Il Browser Gallese va su internet veloce,gratis e Sicuro dalla nascita Su questo sito ci sono i fle d'istallazione e il codice sorgente scritti con...CSS 360 Planetary Calendar: LCO: Documents for the LCO MilestoneGArphics: Backgrounds: GArphics examples converted into PNG-images with a resolution of 1680x1050.GArphics: Beta v0.8: Beta v0.8. Includes built-in examples and a lot of new settings.Helium Frog Animator: Helium Frog Flow Diagram: This file contains a flow diagram showing how the program functions. The image is in .bmp format.Highlighterr for Visual C++ 2010: Highlighterr for Visual C++ 2010 Test Release: Seems I'm updating this on a daily basis now, I keep finding things to add/fix. So stay tuned for updates! Current Version: 1.02 Now picks up chan...HTML Ruby: 6.22.2: Slightly improved performance on inserted ruby Cleaned up the code someiTuner - The iTunes Companion: iTuner 1.2.3767 Beta 3: Beta 3 is requires iTunes 9.1.0.79 or later A Librarian status panel showing active and queued Librarian scanners. This will be hidden behind the ...Jet Login Tool (JetLoginTool): Logout - 1.5.3765.28026: Changed: Will logout from Jet if the "Stop" button is hit Fixed: Bug where A notification is received that the engine has stopped, but it hasn't ...jouba Images Converter: Release: The first beta release for Images ConverterKeep Focused - an enhanced tool for Time Management using Pomodoro Technique: Release 0.3 Alpha: Release Notes (Release 0.3 Alpha) The alpha preview provides the basic functionality used by the Pomodoro Technique. Files 1. Keep Focused Exe...Mercurial to Team Foundation Server Work Item Hook: Version 0.2: Changes Include: Eliminates the need for the Suds package by hand-rolling its own soap implementation Ability to specify columns and computed col...Mews: Mews.Application V0.8: Installation InstuctionsNew Features16569 16571 Fixed Issues16668 Missing Features16567 Known Remaining IssuesLarge text-only articles require la...MiniTwitter: 1.12: MiniTwitter 1.12 更新内容 注意 このバージョンは開発中につき、正式リリースまでに複数回更新されることがあります。 また不安定かもしれませんので、新機能を試したいという方以外には 1.11 をお勧めします。 追加 List 機能に仮対応 タイムラインの振り分け条件として...Multiwfn: multiwfn1.3.1_binary: multiwfn1.3.1_binaryMultiwfn: multiwfn1.3.1_source: multiwfn1.3.1_sourceMVC2 RESTful Library: Source Code: VS2010 Source CodeMy Schedule Tool: MyScheduleTool 0.1: Initial version for MyScheduleTool. If you have any comments about the project, please let me know. My email is cmicmobile@gmail.comNestoria.NET: Nestoria.NET 0.8.1: Provides access to the Nestoria API. Documentation contains a basic getting started guide. Please visit Darren Edge's blog for ongoing developmen...OgmoXNA: OgmoXNA Binaries: Binary release libraries for OgmoXNA and OgmoXNA content pipeline extensions. Includes both Windows and Xbox360 binaries in separate directories.OgmoXNA: OgmoXNA Source: NOTE: THE ASSETS PROVIDED IN THE DEMO GAME DISTRIBUTED WITH THIS SOURCE ARE PROPERTY OF MATT THORSON, AND ARE NOT TO BE USED FOR ANY OTHER PROJECT...PokeIn Comet Ajax Library: PokeIn v07 x64: New FeaturesInstant Client Disconnected Detection Disable Server Push Technology OptionPokeIn Comet Ajax Library: PokeIn v07 x86: New FeaturesInstant Client Disconnected Detection Disable Server Push Technology OptionPowerShell Admin Modules: PAM 0.1: Version 0.1 includes share moduleRehost Image: 1.3.8: Added option to remove resolution/size text from the thumbnails of uploaded images in ImageShack. Fixed issue with FTP servers that give back jun...Site Directory for SharePoint 2010 (from Microsoft Consulting Services, UK): v1.3: Same as v1.2 with the following changes: Source Code and WSP updated to SharePoint 2010 and Visual Studio 2010 RTM releases Fields seperated into...SSIS Credit Card Number Validator 08 (CCNV08): CCNV08-1004Apr-R1: Version Released in Apr 2010SSIS Twitter Suite: v2.0: Upgraded Twitter Task to SSIS 2008sTASKedit: sTASKedit v0.7 Alpha: Features:Import of v56 (CN 1.3.6 v101) and v79 (PWI 1.4.2 v312) tasks.data files Export to v56 (Client) and v55 (Server) Clone & Delete Tasks ...StyleCop for ReSharper: StyleCop for ReSharper 5.0.14724.1: StyleCop for ReSharper 5.0.14724.1 =============== StyleCop 4.3.3.0 ReSharper 5.0.1659.36 Visual Studio 2008 / Visual Studio 2010 Fixes === G...Windows Live ID SSO Luminis Integration: Version 1.2: This new version has been updated for accomodating the new release of the Windows Live SSO Toolkit v4.2.WPF Application Framework (WAF): WPF Application Framework (WAF) 1.0.0.11: Version: 1.0.0.11 (Milestone 11): This release contains the source code of the WPF Application Framework (WAF) and the sample applications. Requi...XAML Code Snippets addin for Visual Studio 2010: Release for VS 2010 RTM: Release built for Visual Studio 2010 RTMXP-More: 1.0: Release Notes Improved VM folder recognition Added About window Added input validation and exception handling If exist, vud and vpcbackupfile...Most Popular ProjectsRawrWBFS ManagerAJAX Control ToolkitSilverlight ToolkitMicrosoft SQL Server Product Samples: Databasepatterns & practices – Enterprise LibraryWindows Presentation Foundation (WPF)ASP.NETMicrosoft SQL Server Community & SamplesPHPExcelMost Active Projectspatterns & practices – Enterprise LibraryRawrGMap.NET - Great Maps for Windows Forms & PresentationBlogEngine.NETParticle Plot PivotNB_Store - Free DotNetNuke Ecommerce Catalog ModuleDotNetZip LibraryFarseer Physics EngineN2 CMSpatterns & practices: Composite WPF and Silverlight

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  • Alice In Wonderland: Good, but not Great

    - by Theo Moore
    We went to see Alice In Wonderland today. We both like Tim Burton a lot (the stranger the better) and like Johnny Depp very well also. After seeing all the previews and such, we were fired up to see this film. Honestly, I thought it was good but not great. I was prepared to be wow-ed, but I wasn't. Perhaps I expected too much. I did like it, but I'll not own it nor would I expect to see it again...unless someone I know decides they want to see it. I was about to say something to reassure you that I wasn't going to provide any spoilers but two things occurred to me: one, I never give spoilers and two, why worry about spoilers for a film that so closely follows a book? My comments about the film are hard to describe, but the basic gist is that it doesn't really feel like it..."works" to me. I can't get any more specific than that, much as I'd like to do so. Something about it seems sort of disjointed and not in that Alice way you'd expect. My only specific comment is that I didn't like the actor who plays Alice very well. She was very flat and just didn't sell he character to me. She seemed a bit, well, plastic. Depp was as good as you'd expect him to be, I am happy to say. Obviously Lewis Carroll couldn't have imagined this made into film, but I can't help thinking that he'd see this and say that Depp was the perfect Mad Hatter. So, I'd definitely recommend seeing it (we saw it in 3D which was cool, but not really necessary) at least once, but don't be surprised if you're kinda meh afterwards.

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  • SQL Server 2008 R2 Installation and the Phantom of SQL Server 2005 Express

    - by Davide Mauri
    Today I’ve happy started to install SQL Server 2008R2 on my development machine, which has this software installed Windows Server 2008 R2 Standard SQL Server 2008 SP1 CU5 Visual Studio 2008 SP1 BOL October 2009 AdventuresWorks2008 Databases SR4 Visual Studio 2010 RTM So, all the basic standard stuff. SQL Server 2008 R2 installation went smooth ‘till somewhere in the middle, where the rule engine checks that software pre-requisite are satisfied before starting to copy files. Here I had this @][@@[?!?! error: “The SQL Server 2005 Express Tools are installed. To continue, remove the SQL Server 2005 Express Tools.” Fun enough, I don’t have and I’ve never had SQL Server 2005 Express on my machine. Armed with patience I analyzed the install log here C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\yyyymmdd_hhmmss\Detail.txt and I’ve found that the rule “Sql2005SsmsExpressFacet” is the one in charge of this check and it look for existance of the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\90\Tools\ShellSEM (on x86) HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SQL Server\90\Tools\ShellSEM (on x64) In my registry I’ve found that key existsing, due to the installation of the uber-cool Red-Gate SQL Search. I removed the registry key and here it is! SQL Server 2008 R2 is installing while I’m writing this post. A note to Microsoft: can you please add more detailed information on the setup while such error happens. Just saying “you have SQL Server 2005 Express installed” is not enough. Please show us what the rule look for and why it has failed directly in the Detailed Report, so that we don’t have to spend time to look for the needle in the logs. Thanks! :) PS I did a side-by-side installation with the existing SQL Server 2008 instance. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • build a Database from Ms Word list information...

    - by Jayron Soares
    Please someone can advise me how to approach a given problem: I have a sequential list of metadata in a document in MS Word. The basic idea is create a python algorithm to iterate over of the information, retrieving just the name of PROCESS, when is made a queue, from a database. for example. Process: Process Walker (1965) Exact reference: Walker Process Equipment., nc. v. Food Machinery Corp.. Link: http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=US&vol=382&invol= Type of procedure: Certiorari To The United States Court of Appeals for the SeventhCircuit. Parties: Walker Process Equipment, Inc. Sector: Systems is … Start Date: October 12-13 Arguedas, 1965 Summary: Food Machinery Company has initiated a process to stop or slow the entry of competitors through the use of a patent obtained by fraud. The case concerned a patenton "knee ction swing diffusers" used in aeration equipment for sewage treatment systems, and the question was whether "the maintenance and enforcement of a patent obtained by fraud before the patent office" may be a basis for antitrust punishment. Report of the evolution process: petitioner, in answer to respond .. Importance: a) First case which established an analysis for the diagnosis of dispute… There are about 200 pages containing the information above. I have in mind the idea of creating an algorithm in python to be able to break this information sequenced and try to store them in a web database[open source application that I’m looking for] in order to allow for free consultations ...

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  • Phpmyadmin Not Working

    - by glenbl54
    I recently installed phpmyadmin onto ubuntu server 10.04 using sudo apt-get install phpmyadmin The installation went fine and everything was working including phpmyadmin. I then performed a restart of the server and now apache2 starts up but when I navigate to http://192.168.1.72/phpmyadmin/ I am getting a 403 error. I have included /etc/phpmyadmin/apache.conf file in /etc/apahe2/apache2.conf file /etc/phpmyadmin/apache.conf # phpMyAdmin default Apache configuration Alias /phpmyadmin /usr/share/phpmyadmin <Directory /usr/share/phpmyadmin> Options FollowSymLinks DirectoryIndex index.php <IfModule mod_php5.c> AddType application/x-httpd-php .php php_flag magic_quotes_gpc Off php_flag track_vars On php_flag register_globals Off php_value include_path . </IfModule> </Directory> # Authorize for setup <Directory /usr/share/phpmyadmin/setup> <IfModule mod_authn_file.c> AuthType Basic AuthName "phpMyAdmin Setup" AuthUserFile /etc/phpmyadmin/htpasswd.setup </IfModule> Require valid-user </Directory> #Disallow web access to directories that don't need it <Directory /usr/share/phpmyadmin/libraries> Order Deny,Allow Deny from All </Directory> <Directory /usr/share/phpmyadmin/setup/lib> Order Deny,Allow Deny from All </Directory> The only change that was made since phpmyadmin was installed was that timetrex was installed. Is there anyway to manually start phpmyadmin or should it already be working once apache started?

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  • Oracle pl\sql question for my homework in oracle 11G class [migrated]

    - by Bjolds
    I am new to oracle 11G programming and i have run into a tough situation with pl\sql funtions and automation. I ame unsure how to create the function for the automation of Registration system for a College registration system. Here is what i want to do. I want to automate the registrations system so that it automaticly registers students. Then I want a procedure to automate the grading system. I have included the code that i am written to make most of this assignment work which it does but unsure how to incorporate Pl\SQL automated fuctions for the registrations system, and the grading system. So Any help or Ideas I would greatly appreciate please. set Linesize 250 set pagesize 150 drop table student; drop table faculty; drop table Course; drop table Section; drop table location; DROP TABLE courseInstructor; DROP TABLE Registration; DROP TABLE grade; create table student( studentid number(10), Lastname varchar2(20), Firstname Varchar2(20), MI Char(1), address Varchar2(20), city Varchar2(20), state Char(2), zip Varchar2(10), HomePhone Varchar2(10), Workphone Varchar2(10), DOB Date, Pin VARCHAR2(10), Status Char(1)); ALTER TABLE Student Add Constraint Student_StudentID_pk Primary Key (studentID); Insert into student values (1,'xxxxxxxx','xxxxxxxxxx','x','xxxxxxxxxxxxxxx','Columbus','oh','44159','xxx-xxx-xxxx','xxx-xxx-xxxx','06-Mar-1957','1211','c'); create table faculty( FacultyID Number(10), FirstName Varchar2(20), Lastname Varchar2(20), MI Char(1), workphone Varchar2(10), CellPhone Varchar2(10), Rank Varchar2(20), Experience Varchar2(10), Status Char(1)); ALTER TABLE Faculty ADD Constraint Faculty_facultyId_PK PRIMARY KEY (FacultyID); insert into faculty values (1,'xxx','xxxxxxxxxxxx',xxx-xxx-xxxx','xxx-xxx-xxxx','professor','20','f'); create table Course( CourseId number(10), CourseNumber Varchar2(20), CourseName Varchar(20), Description Varchar(20), CreditHours Number(4), Status Char(1)); ALTER TABLE Course ADD Constraint Course_CourseID_pk PRIMARY KEY(CourseID); insert into course values (1,'cit 100','computer concepts','introduction to PCs','3.0','o'); insert into course values (2,'cit 101','Database Program','Database Programming','4.0','o'); insert into course values (3,'Math 101','Algebra I','Algebra I Concepts','5.0','o'); insert into course values (4,'cit 102a','Pc applications','Aplications 1','3.0','o'); insert into course values (5,'cit 102b','pc applications','applications 2','3.0','o'); insert into course values (6,'cit 102c','pc applications','applications 3','3.0','o'); insert into course values (7,'cit 103','computer concepts','introduction systems','3.0','c'); insert into course values (8,'cit 110','Unified language','UML design','3.0','o'); insert into course values (9,'cit 165','cobol','cobol programming','3.0','o'); insert into course values (10,'cit 167','C++ Programming 1','c++ programming','4.0','o'); insert into course values (11,'cit 231','Expert Excel','spreadsheet apps','3.0','o'); insert into course values (12,'cit 233','expert Access','database devel.','3.0','o'); insert into course values (13,'cit 169','Java Programming I','Java Programming I','3.0','o'); insert into course values (14,'cit 263','Visual Basic','Visual Basic Prog','3.0','o'); insert into course values (15,'cit 275','system analysis 2','System Analysis 2','3.0','o'); create table Section( SectionID Number(10), CourseId Number(10), SectionNumber VarChar2(10), Days Varchar2(10), StartTime Date, EndTime Date, LocationID Number(10), SeatAvailable Number(3), Status Char(1)); ALTER TABLE Section ADD Constraint Section_SectionID_PK PRIMARY KEY(SectionID); insert into section values (1,1,'18977','r','21-Sep-2011','10-Dec-2011','1','89','o'); create table Location( LocationId Number(10), Building Varchar2(20), Room Varchar2(5), Capacity Number(5), Satus Char(1)); ALTER TABLE Location ADD Constraint Location_LocationID_pk PRIMARY KEY (LocationID); insert into Location values (1,'Clevleand Hall','cl209','35','o'); insert into Location values (2,'Toledo Circle','tc211','45','o'); insert into Location values (3,'Akron Square','as154','65','o'); insert into Location values (4,'Cincy Hall','ch100','45','o'); insert into Location values (5,'Springfield Dome','SD','35','o'); insert into Location values (6,'Dayton Dorm','dd225','25','o'); insert into Location values (7,'Columbus Hall','CB354','15','o'); insert into Location values (8,'Cleveland Hall','cl204','85','o'); insert into Location values (9,'Toledo Circle','tc103','75','o'); insert into Location values (10,'Akron Square','as201','46','o'); insert into Location values (11,'Cincy Hall','ch301','73','o'); insert into Location values (12,'Dayton Dorm','dd245','57','o'); insert into Location values (13,'Springfield Dome','SD','65','o'); insert into Location values (14,'Cleveland Hall','cl241','10','o'); insert into Location values (15,'Toledo Circle','tc211','27','o'); insert into Location values (16,'Akron Square','as311','28','o'); insert into Location values (17,'Cincy Hall','ch415','73','o'); insert into Location values (18,'Toledo Circle','tc111','67','o'); insert into Location values (19,'Springfield Dome','SD','69','o'); insert into Location values (20,'Dayton Dorm','dd211','45','o'); Alter Table Student Add Constraint student_Zip_CK Check(Rtrim (Zip,'1234567890-') is null); Alter Table Student ADD Constraint Student_Status_CK Check(Status In('c','t')); Alter Table Student ADD Constraint Student_MI_CK2 Check(RTRIM(MI,'abcdefghijklmnopqrstuvwxyz')is Null); Alter Table Student Modify pin not Null; Alter table Faculty Add Constraint Faculty_Status_CK Check(Status In('f','a','i')); Alter table Faculty ADD Constraint Faculty_Rank_CK Check(Rank In ('professor','doctor','instructor','assistant','tenure')); Alter table Faculty ADD Constraint Faculty_MI_CK2 Check(RTRIM(MI,'abcdefghijklmnopqrstuvwxyz')is Null); Update Section Set Starttime = To_date('09-21-2011 6:00 PM', 'mm-dd-yyyy hh:mi pm'); Update Section Set Endtime = To_date('12-10-2011 9:50 PM', 'mm-dd-yyyy hh:mi pm'); alter table Section Add Constraint StartTime_Status_CK Check (starttime < Endtime); Alter Table Section Add Constraint Section_StartTime_ck check (StartTime < EndTime); Alter Table Section ADD Constraint Section_CourseId_FK FOREIGN KEY (CourseID) References Course(CourseId); Alter Table Section ADD Constraint Section_LocationID_FK FOREIGN KEY (LocationID) References Location (LocationId); Alter Table Section ADD Constraint Section_Days_CK Check(RTRIM(Days,'mtwrfsu')IS Null); update section set seatavailable = '99'; Alter Table Section ADD Constraint Section_SeatsAvailable_CK Check (SeatAvailable < 100); Alter Table Course Add Constraint Course_CreditHours_ck check(CreditHours < = 6.0); update location set capacity = '99'; Alter Table Location Add Constraint Location_Capacity_CK Check(Capacity < 100); Create Table Registration ( StudentID Number(10), SectionID Number(10), Constraint Registration_pk Primary key (studentId, Sectionid)); Insert into registration values (1, 2); Insert into Registration values (2, 3); Insert into registration values (3, 4); Insert into registration values (4, 5); Insert into registration values (5, 6); Insert into registration values (6, 7); Insert into registration values (7, 8); Insert into registration values (8, 9); insert into registration values (9, 10); insert into registration values (10, 11); insert into registration values (9, 12); insert into registration values (8, 13); insert into registration values (7, 14); insert into registration values (6, 15); insert into registration values (5, 17); insert into registration values (4, 18); insert into registration values (3, 19); insert into registration values (2, 20); insert into registration values (1, 21); insert into registration values (2, 22); insert into registration values (3, 23); insert into registration values (4, 24); insert into registration values (5, 25); Insert into registration values (6, 24); insert into registration values (7, 23); insert into registration values (8, 22); insert into registration values (9, 21); insert into registration values (10, 20); insert into registration values (9, 19); insert into registration values (8, 17); Create Table courseInstructor( FacultyID Number(10), SectionID Number(10), Constraint CourseInstructor_pk Primary key (FacultyId, SectionID)); insert into courseInstructor values (1, 1); insert into courseInstructor values (2, 2); insert into courseInstructor values (3, 3); insert into courseInstructor values (4, 4); insert into courseInstructor values (5, 5); insert into courseInstructor values (5, 6); insert into courseInstructor values (4, 7); insert into courseInstructor values (3, 8); insert into courseInstructor values (2, 9); insert into courseInstructor values (1, 10); insert into courseInstructor values (5, 11); insert into courseInstructor values (4, 12); insert into courseInstructor values (3, 13); insert into courseInstructor values (2, 14); insert into courseInstructor values (1, 15); Create table grade( StudentID Number(10), SectionID Number(10), Grade Varchar2(1), Constraint grade_pk Primary key (StudentID, SectionID)); CREATE OR REPLACE TRIGGER TR_CreateGrade AFTER INSERT ON Registration FOR EACH ROW BEGIN INSERT INTO grade (SectionID,StudentID,Grade) VALUES(:New.SectionID,:New.StudentID,NULL); END TR_createGrade; / CREATE OR REPLACE FORCE VIEW V_reg_student_course AS SELECT Registration.StudentID, student.LastName, student.FirstName, course.CourseName, Registration.SectionID, course.CreditHours, section.Days, TO_CHAR(StartTime, 'MM/DD/YYYY') AS StartDate, TO_CHAR(StartTime, 'HH:MI PM') AS StartTime, TO_CHAR(EndTime, 'MM/DD/YYYY') AS EndDate, TO_CHAR(EndTime, 'HH:MI PM') AS EndTime, location.Building, location.Room FROM registration, student, section, course, location WHERE registration.StudentID = student.StudentID AND registration.SectionID = section.SectionID AND section.LocationID = location.LocationID AND section.CourseID = course.CourseID; CREATE OR REPLACE FORCE VIEW V_teacher_to_course AS SELECT courseInstructor.FacultyID, faculty.FirstName, faculty.LastName, courseInstructor.SectionID, section.Days, TO_CHAR(StartTime, 'MM/DD/YYYY') AS StartDate, TO_CHAR(StartTime, 'HH:MI PM') AS StartTime, TO_CHAR(EndTime, 'MM/DD/YYYY') AS EndDate, TO_CHAR(EndTime, 'HH:MI PM') AS EndTime, location.Building, location.Room FROM courseInstructor, faculty, section, course, location WHERE courseInstructor.FacultyID = faculty.FacultyID AND courseInstructor.SectionID = section.SectionID AND section.LocationID = location.LocationID AND section.CourseID = course.CourseID; SELECT * FROM V_reg_student_course; SELECT * FROM V_teacher_to_course;

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  • Following the Thread in OSB

    - by Antony Reynolds
    Threading in OSB The Scenario I recently led an OSB POC where we needed to get high throughput from an OSB pipeline that had the following logic: 1. Receive Request 2. Send Request to External System 3. If Response has a particular value   3.1 Modify Request   3.2 Resend Request to External System 4. Send Response back to Requestor All looks very straightforward and no nasty wrinkles along the way.  The flow was implemented in OSB as follows (see diagram for more details): Proxy Service to Receive Request and Send Response Request Pipeline   Copies Original Request for use in step 3 Route Node   Sends Request to External System exposed as a Business Service Response Pipeline   Checks Response to Check If Request Needs to Be Resubmitted Modify Request Callout to External System (same Business Service as Route Node) The Proxy and the Business Service were each assigned their own Work Manager, effectively giving each of them their own thread pool. The Surprise Imagine our surprise when, on stressing the system we saw it lock up, with large numbers of blocked threads.  The reason for the lock up is due to some subtleties in the OSB thread model which is the topic of this post.   Basic Thread Model OSB goes to great lengths to avoid holding on to threads.  Lets start by looking at how how OSB deals with a simple request/response routing to a business service in a route node. Most Business Services are implemented by OSB in two parts.  The first part uses the request thread to send the request to the target.  In the diagram this is represented by the thread T1.  After sending the request to the target (the Business Service in our diagram) the request thread is released back to whatever pool it came from.  A multiplexor (muxer) is used to wait for the response.  When the response is received the muxer hands off the response to a new thread that is used to execute the response pipeline, this is represented in the diagram by T2. OSB allows you to assign different Work Managers and hence different thread pools to each Proxy Service and Business Service.  In out example we have the “Proxy Service Work Manager” assigned to the Proxy Service and the “Business Service Work Manager” assigned to the Business Service.  Note that the Business Service Work Manager is only used to assign the thread to process the response, it is never used to process the request. This architecture means that while waiting for a response from a business service there are no threads in use, which makes for better scalability in terms of thread usage. First Wrinkle Note that if the Proxy and the Business Service both use the same Work Manager then there is potential for starvation.  For example: Request Pipeline makes a blocking callout, say to perform a database read. Business Service response tries to allocate a thread from thread pool but all threads are blocked in the database read. New requests arrive and contend with responses arriving for the available threads. Similar problems can occur if the response pipeline blocks for some reason, maybe a database update for example. Solution The solution to this is to make sure that the Proxy and Business Service use different Work Managers so that they do not contend with each other for threads. Do Nothing Route Thread Model So what happens if there is no route node?  In this case OSB just echoes the Request message as a Response message, but what happens to the threads?  OSB still uses a separate thread for the response, but in this case the Work Manager used is the Default Work Manager. So this is really a special case of the Basic Thread Model discussed above, except that the response pipeline will always execute on the Default Work Manager.   Proxy Chaining Thread Model So what happens when the route node is actually calling a Proxy Service rather than a Business Service, does the second Proxy Service use its own Thread or does it re-use the thread of the original Request Pipeline? Well as you can see from the diagram when a route node calls another proxy service then the original Work Manager is used for both request pipelines.  Similarly the response pipeline uses the Work Manager associated with the ultimate Business Service invoked via a Route Node.  This actually fits in with the earlier description I gave about Business Services and by extension Route Nodes they “… uses the request thread to send the request to the target”. Call Out Threading Model So what happens when you make a Service Callout to a Business Service from within a pipeline.  The documentation says that “The pipeline processor will block the thread until the response arrives asynchronously” when using a Service Callout.  What this means is that the target Business Service is called using the pipeline thread but the response is also handled by the pipeline thread.  This implies that the pipeline thread blocks waiting for a response.  It is the handling of this response that behaves in an unexpected way. When a Business Service is called via a Service Callout, the calling thread is suspended after sending the request, but unlike the Route Node case the thread is not released, it waits for the response.  The muxer uses the Business Service Work Manager to allocate a thread to process the response, but in this case processing the response means getting the response and notifying the blocked pipeline thread that the response is available.  The original pipeline thread can then continue to process the response. Second Wrinkle This leads to an unfortunate wrinkle.  If the Business Service is using the same Work Manager as the Pipeline then it is possible for starvation or a deadlock to occur.  The scenario is as follows: Pipeline makes a Callout and the thread is suspended but still allocated Multiple Pipeline instances using the same Work Manager are in this state (common for a system under load) Response comes back but all Work Manager threads are allocated to blocked pipelines. Response cannot be processed and so pipeline threads never unblock – deadlock! Solution The solution to this is to make sure that any Business Services used by a Callout in a pipeline use a different Work Manager to the pipeline itself. The Solution to My Problem Looking back at my original workflow we see that the same Business Service is called twice, once in a Routing Node and once in a Response Pipeline Callout.  This was what was causing my problem because the response pipeline was using the Business Service Work Manager, but the Service Callout wanted to use the same Work Manager to handle the responses and so eventually my Response Pipeline hogged all the available threads so no responses could be processed. The solution was to create a second Business Service pointing to the same location as the original Business Service, the only difference was to assign a different Work Manager to this Business Service.  This ensured that when the Service Callout completed there were always threads available to process the response because the response processing from the Service Callout had its own dedicated Work Manager. Summary Request Pipeline Executes on Proxy Work Manager (WM) Thread so limited by setting of that WM.  If no WM specified then uses WLS default WM. Route Node Request sent using Proxy WM Thread Proxy WM Thread is released before getting response Muxer is used to handle response Muxer hands off response to Business Service (BS) WM Response Pipeline Executes on Routed Business Service WM Thread so limited by setting of that WM.  If no WM specified then uses WLS default WM. No Route Node (Echo functionality) Proxy WM thread released New thread from the default WM used for response pipeline Service Callout Request sent using proxy pipeline thread Proxy thread is suspended (not released) until the response comes back Notification of response handled by BS WM thread so limited by setting of that WM.  If no WM specified then uses WLS default WM. Note this is a very short lived use of the thread After notification by callout BS WM thread that thread is released and execution continues on the original pipeline thread. Route/Callout to Proxy Service Request Pipeline of callee executes on requestor thread Response Pipeline of caller executes on response thread of requested proxy Throttling Request message may be queued if limit reached. Requesting thread is released (route node) or suspended (callout) So what this means is that you may get deadlocks caused by thread starvation if you use the same thread pool for the business service in a route node and the business service in a callout from the response pipeline because the callout will need a notification thread from the same thread pool as the response pipeline.  This was the problem we were having. You get a similar problem if you use the same work manager for the proxy request pipeline and a business service callout from that request pipeline. It also means you may want to have different work managers for the proxy and business service in the route node. Basically you need to think carefully about how threading impacts your proxy services. References Thanks to Jay Kasi, Gerald Nunn and Deb Ayers for helping to explain this to me.  Any errors are my own and not theirs.  Also thanks to my colleagues Milind Pandit and Prasad Bopardikar who travelled this road with me. OSB Thread Model Great Blog Post on Thread Usage in OSB

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  • Advice for a computer science sophomore in college?

    - by RDas
    Hi Everyone! I'm a sophomore in college majoring in Computer Science and Math. I have always loved programming. I started programming in C when I was nine years old and over the years I've picked up Visual Basic, C#, Java, C++, JavaScript, Objective-C, Python, Ruby, elementary Haskell and elementary Erlang, and I learned Perl back in the day which I've mostly forgotten. I have not done much network programming. I have done CGI programming, but that was about six/seven years ago. I've done some socket programming and written (school) programs to do interprocess communication, which I understood and liked. I'm taking a course on client/server programming and another one on network security next semester, which I am really looking forward to. I'm seeking advice on how to proceed with future learning. I've mostly done application (mobile and desktop) development, not much of web development. I'd like to pick up some web development this coming semester. Since I know Ruby and Python, should I start by learning Django and/or Rails? Any other suggestions on starting web development? I have a good understanding of HTML and CSS. Also, I'd also like to know how hard it is to pick up and be good (read: productive) in functional programming languages coming from a purely structured/object oriented background? I've been reading up on Erlang and Haskell, and I'd like to know your opinions on whether it's worth my time trying to learn them. What about Lisp, Scheme and other functional languages? Any help/ideas would be really appreciated.

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  • LLBLGen Pro and JSON serialization

    - by FransBouma
    I accidentally removed a reply from my previous blogpost, and as this blog-engine here at weblogs.asp.net is apparently falling apart, I can't re-add it as it thought it would be wise to disable comment controls on all posts, except new ones. So I'll post the reply here as a quote and reply on it. 'Steven' asks: What would the future be for LLBLGen Pro to support JSON for serialization? Would it be worth the effort for a LLBLGenPro user to bother creating some code templates to produce additional JSON serializable classes? Or just create some basic POCO classes which could be used for exchange of client/server data and use DTO to map these back to LLBGenPro ones? If I understand the work around, it is at the expense of losing xml serialization. Well, as described in the previous post, to enable JSON serialization, you can do that with a couple of lines and some attribute assignments. However, indeed, the attributes might make the XML serialization not working, as described in the previous blogpost. This is the case if the service you're using serializes objects using the DataContract serializer: this serializer will give up to serialize the entity objects to XML as the entity objects implement IXmlSerializable and this is a no-go area for the DataContract serializer. However, if your service doesn't use a DataContract serializer, or you serialize the objects manually to Xml using an xml serializer, you're fine. When you want to switch to Xml serializing again, instead of JSON in WebApi, and you have decorated the entity classes with the data-contract attributes, you can switch off the DataContract serializer, by setting a global configuration setting: var xml = GlobalConfiguration.Configuration.Formatters.XmlFormatter; xml.UseXmlSerializer = true; This will make the WebApi use the XmlSerializer, and run the normal IXmlSerializable interface implementation.

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  • C#/.NET Little Wonders: The EventHandler and EventHandler&lt;TEventArgs&gt; delegates

    - by James Michael Hare
    Once again, in this series of posts I look at the parts of the .NET Framework that may seem trivial, but can help improve your code by making it easier to write and maintain. The index of all my past little wonders posts can be found here. In the last two weeks, we examined the Action family of delegates (and delegates in general), and the Func family of delegates and how they can be used to support generic, reusable algorithms and classes. So this week, we are going to look at a handy pair of delegates that can be used to eliminate the need for defining custom delegates when creating events: the EventHandler and EventHandler<TEventArgs> delegates. Events and delegates Before we begin, let’s quickly consider events in .NET.  According to the MSDN: An event in C# is a way for a class to provide notifications to clients of that class when some interesting thing happens to an object. So, basically, you can create an event in a type so that users of that type can subscribe to notifications of things of interest.  How is this different than some of the delegate programming that we talked about in the last two weeks?  Well, you can think of an event as a special access modifier on a delegate.  Some differences between the two are: Events are a special access case of delegates They behave much like delegates instances inside the type they are declared in, but outside of that type they can only be (un)subscribed to. Events can specify add/remove behavior explicitly If you want to do additional work when someone subscribes or unsubscribes to an event, you can specify the add and remove actions explicitly. Events have access modifiers, but these only specify the access level of those who can (un)subscribe A public event, for example, means anyone can (un)subscribe, but it does not mean that anyone can raise (invoke) the event directly.  Events can only be raised by the type that contains them In contrast, if a delegate is visible, it can be invoked outside of the object (not even in a sub-class!). Events tend to be for notifications only, and should be treated as optional Semantically speaking, events typically don’t perform work on the the class directly, but tend to just notify subscribers when something of note occurs. My basic rule-of-thumb is that if you are just wanting to notify any listeners (who may or may not care) that something has happened, use an event.  However, if you want the caller to provide some function to perform to direct the class about how it should perform work, make it a delegate. Declaring events using custom delegates To declare an event in a type, we simply use the event keyword and specify its delegate type.  For example, let’s say you wanted to create a new TimeOfDayTimer that triggers at a given time of the day (as opposed to on an interval).  We could write something like this: 1: public delegate void TimeOfDayHandler(object source, ElapsedEventArgs e); 2:  3: // A timer that will fire at time of day each day. 4: public class TimeOfDayTimer : IDisposable 5: { 6: // Event that is triggered at time of day. 7: public event TimeOfDayHandler Elapsed; 8:  9: // ... 10: } The first thing to note is that the event is a delegate type, which tells us what types of methods may subscribe to it.  The second thing to note is the signature of the event handler delegate, according to the MSDN: The standard signature of an event handler delegate defines a method that does not return a value, whose first parameter is of type Object and refers to the instance that raises the event, and whose second parameter is derived from type EventArgs and holds the event data. If the event does not generate event data, the second parameter is simply an instance of EventArgs. Otherwise, the second parameter is a custom type derived from EventArgs and supplies any fields or properties needed to hold the event data. So, in a nutshell, the event handler delegates should return void and take two parameters: An object reference to the object that raised the event. An EventArgs (or a subclass of EventArgs) reference to event specific information. Even if your event has no additional information to provide, you are still expected to provide an EventArgs instance.  In this case, feel free to pass the EventArgs.Empty singleton instead of creating new instances of EventArgs (to avoid generating unneeded memory garbage). The EventHandler delegate Because many events have no additional information to pass, and thus do not require custom EventArgs, the signature of the delegates for subscribing to these events is typically: 1: // always takes an object and an EventArgs reference 2: public delegate void EventHandler(object sender, EventArgs e) It would be insane to recreate this delegate for every class that had a basic event with no additional event data, so there already exists a delegate for you called EventHandler that has this very definition!  Feel free to use it to define any events which supply no additional event information: 1: public class Cache 2: { 3: // event that is raised whenever the cache performs a cleanup 4: public event EventHandler OnCleanup; 5:  6: // ... 7: } This will handle any event with the standard EventArgs (no additional information).  But what of events that do need to supply additional information?  Does that mean we’re out of luck for subclasses of EventArgs?  That’s where the generic for of EventHandler comes into play… The generic EventHandler<TEventArgs> delegate Starting with the introduction of generics in .NET 2.0, we have a generic delegate called EventHandler<TEventArgs>.  Its signature is as follows: 1: public delegate void EventHandler<TEventArgs>(object sender, TEventArgs e) 2: where TEventArgs : EventArgs This is similar to EventHandler except it has been made generic to support the more general case.  Thus, it will work for any delegate where the first argument is an object (the sender) and the second argument is a class derived from EventArgs (the event data). For example, let’s say we wanted to create a message receiver, and we wanted it to have a few events such as OnConnected that will tell us when a connection is established (probably with no additional information) and OnMessageReceived that will tell us when a new message arrives (probably with a string for the new message text). So for OnMessageReceived, our MessageReceivedEventArgs might look like this: 1: public sealed class MessageReceivedEventArgs : EventArgs 2: { 3: public string Message { get; set; } 4: } And since OnConnected needs no event argument type defined, our class might look something like this: 1: public class MessageReceiver 2: { 3: // event that is called when the receiver connects with sender 4: public event EventHandler OnConnected; 5:  6: // event that is called when a new message is received. 7: public event EventHandler<MessageReceivedEventArgs> OnMessageReceived; 8:  9: // ... 10: } Notice, nowhere did we have to define a delegate to fit our event definition, the EventHandler and generic EventHandler<TEventArgs> delegates fit almost anything we’d need to do with events. Sidebar: Thread-safety and raising an event When the time comes to raise an event, we should always check to make sure there are subscribers, and then only raise the event if anyone is subscribed.  This is important because if no one is subscribed to the event, then the instance will be null and we will get a NullReferenceException if we attempt to raise the event. 1: // This protects against NullReferenceException... or does it? 2: if (OnMessageReceived != null) 3: { 4: OnMessageReceived(this, new MessageReceivedEventArgs(aMessage)); 5: } The above code seems to handle the null reference if no one is subscribed, but there’s a problem if this is being used in multi-threaded environments.  For example, assume we have thread A which is about to raise the event, and it checks and clears the null check and is about to raise the event.  However, before it can do that thread B unsubscribes to the event, which sets the delegate to null.  Now, when thread A attempts to raise the event, this causes the NullReferenceException that we were hoping to avoid! To counter this, the simplest best-practice method is to copy the event (just a multicast delegate) to a temporary local variable just before we raise it.  Since we are inside the class where this event is being raised, we can copy it to a local variable like this, and it will protect us from multi-threading since multicast delegates are immutable and assignments are atomic: 1: // always make copy of the event multi-cast delegate before checking 2: // for null to avoid race-condition between the null-check and raising it. 3: var handler = OnMessageReceived; 4: 5: if (handler != null) 6: { 7: handler(this, new MessageReceivedEventArgs(aMessage)); 8: } The very slight trade-off is that it’s possible a class may get an event after it unsubscribes in a multi-threaded environment, but this is a small risk and classes should be prepared for this possibility anyway.  For a more detailed discussion on this, check out this excellent Eric Lippert blog post on Events and Races. Summary Generic delegates give us a lot of power to make generic algorithms and classes, and the EventHandler delegate family gives us the flexibility to create events easily, without needing to redefine delegates over and over.  Use them whenever you need to define events with or without specialized EventArgs.   Tweet Technorati Tags: .NET, C#, CSharp, Little Wonders, Generics, Delegates, EventHandler

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  • Where to find other versions of Opera browser as deb packages?

    - by cipricus
    I used Opera mainly for the Unite feature now to be abandoned. It is missing in v. 12. Some say its features will re-emerge in future extensions etc. Until then, Unite is still accessible in v. 11. Where do I get the v.11 deb? P.S. In fact it seems that opera unite (at least in its older form) is dying while I am editing this question. Access to opera-unite applications from within opera-unite is poor or absent. This issue is obscure to me for now (31.08.2012) because yesterday I have installed v12 in Windows OS (with opera-unite and basic applications - file sharing and media player - already installed) and it is still working (server is working). The v12 Ubuntu version came today without unite, and after installing v11 (which has unite) I could not get applications (file sharing, etc). But they are still available: here and after downloading these files which have te .ua extension, they can be installed by opening them with Opera (v.11) But as opera-unite is no longer supported, it is possible that the server that provides the file sharing etc will soon be unaccessible. Even if that is the case the question should maybe not be closed at it has a general usefulness independently of the unite issue.

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  • Java-JDBC-MySQL Error

    - by LeonardPeris
    I'm trying to get my java program to talk to a MySQL DB. So i did some reading and downloaded MySQL Connector/J. I've extracted it into my home directory ~. Here are the contents. user@hamster:~$ ls LoadDriver.class LoadDriver.java mysql-connector-java-5.1.18-bin.jar The contents of LoadDriver.java are user@hamster:~$ cat LoadDriver.java import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; // Notice, do not import com.mysql.jdbc.* // or you will have problems! public class LoadDriver { public static void main(String[] args) { try { // The newInstance() call is a work around for some // broken Java implementations Class.forName("com.mysql.jdbc.Driver").newInstance(); } catch (Exception ex) { System.out.println(ex); } } } The contents are the same from http://dev.mysql.com/doc/refman/5.1/en/connector-j-usagenotes-basic.html#connector-j-usagenotes-connect-drivermanager with the only change that the Exception is being printed to console in the catch block. I compile it as follows leonard@hamster:~$ javac LoadDriver.java When I try to execute it, the following is the ouput. leonard@hamster:~$ java LoadDriver java.lang.ClassNotFoundException: com.mysql.jdbc.Driver This output is consistent with the executing command, but when trying to run it with the prescribed CLASSPATH method I run into the following issue. leonard@hamster:~$ java -cp /home/leonard/mysql-connector-java-5.1.18-bin.jar LoadDriver Exception in thread "main" java.lang.NoClassDefFoundError: LoadDriver Caused by: java.lang.ClassNotFoundException: LoadDriver at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:321) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:266) Could not find the main class: LoadDriver. Program will exit. Am I missing something? How do I get MySQL's own code samples running.

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  • How do I fix these LibreOffice unmet dependencies?

    - by Lucky
    The following packages have unmet dependencies: libreoffice: Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed Depends: libreoffice-base but it is not going to be installed Depends: libreoffice-report-builder-bin but it is not going to be installed Depends: ttf-dejavu but it is not going to be installed Depends: ttf-sil-gentium-basic but it is not going to be installed Depends: libreoffice-filter-mobiledev but it is not going to be installed Depends: libreoffice-java-common (>= 1:3.4.4~) but it is not going to be installed libreoffice-base-core : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed libreoffice-calc : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed libreoffice-draw : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed libreoffice-gnome : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed libreoffice-gtk : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed libreoffice-impress : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed libreoffice-math : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed libreoffice-writer : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed python-uno : Depends: libreoffice-core (= 1:3.4.4-0ubuntu1) but 1:3.4.3-3ubuntu2 is to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

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  • July, the 31 Days of SQL Server DMO’s – Day 1 (sys.dm_exec_requests)

    - by Tamarick Hill
    The first DMO that I would like to introduce you to is one of the most common and basic DMV’s out there. I use the term DMV because this DMO is actually a view as opposed to a function. This DMV is server-scoped and it returns information about all requests that are currently executing on your SQL Server instance. To illustrate what this DMV returns, lets take a look at the results. As you can see, this DMV returns a wealth of information about requests occurring on your server. You are able to see the SPID, the start time of a request, current status, and the command the SPID is executing. In addition to this you see columns for sql_handle and plan_handle. These columns (when combined with other DMO’s we will discuss later) can return the actual sql text that is being executed on your server as well as the actual execution plan that is cached and being used. This DMV also returns information about various wait types that may be occurring for your spid. The percent_complete column displays a percentage to completion for certain database actions such as DBCC CheckDB, Database Restores, Rollback’s, etc. In addition to these, you are also able to see the amount of reads, writes, and cpu that the SPID has consumed. You will find this DMV to be one of the primary DMV’s that you use when looking for information about what is occurring on your server.

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  • Friday Fun: Vehicles

    - by Mysticgeek
    Friday has finally arrived and it’s time to ignore spreadsheets and TPS reports and waste time playing a flash game. Today we take a look at the fun puzzle game called Vehicles. Vehicles This is a fun game with cartoon style graphics where you navigate vehicles to solve different puzzles. You navigate the vehicles through different puzzle situations by clicking on them with your mouse. You’re given basic instructions on how to complete each level. You’ll need to strategically place the vehicles so you can knock the black vehicles off the screen. As you progress up the levels, they become more challenging and if you need to, you can restart it at any time. Since it’s Friday, and you’re sick of your job, Vehicles is a fun puzzle game to keep your mind of the boringness of work until it’s time for weekend freedom. Play Vehicles at FreeWebArcade Similar Articles Productive Geek Tips Friday Fun: Relieve Workweek Frustration Playing Mad MondayFriday Fun: Uphill RushFriday Fun: Battlefield HeroesFriday Fun: Portal, the Flash VersionFriday Fun: Play 3D Rally Racing in Google Chrome TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips VMware Workstation 7 Acronis Online Backup DVDFab 6 Revo Uninstaller Pro FetchMp3 Can Download Videos & Convert Them to Mp3 Use Flixtime To Create Video Slideshows Creating a Password Reset Disk in Windows Bypass Waiting Time On Customer Service Calls With Lucyphone MELTUP – "The Beginning Of US Currency Crisis And Hyperinflation" Enable or Disable the Task Manager Using TaskMgrED

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  • OpenGL ES Shader help (Blending)

    - by Chris
    Earlier I required assistance getting to grips with how to retain the alpha channel of a transparent texture in my colourised texture shader program. Whilst playing with that first version of my program (before obtaining the solution to my first requirement), I managed to enable transparency for the whole texture (effectively blending via GLSL), and I quite liked this, and I would now like to know if and how it is possible to retain this blending effect, on top of the existing output without affecting the original alpha channel - as I don't know how to input this transparency via the parameter that is already being provided with the textures alpha channel. A basic example of the blending program I am referring to (minus any other functionality) is as follows... varying vec2 texCoord; uniform sampler2D texSampler; void main() { gl_FragColor = vec4(texture2D(texSampler,texCoord).xyz,0.5); } Where 0.5 is the transparency (blending effect) of the whole texture. This is the current version of my program, which provides the ability to colour a texture according the colour parameter passed to the program, and retains the alpha channel of the original texture. varying vec2 texCoord; uniform sampler2D texSampler; uniform vec3 colour; void main() { gl_FragColor = vec4(colour,1) * vec4(texture2D(texSampler,texCoord).xyz,texture2D(texSampler,texCoord).w); } I need to know if it is possible to apply transparency on top this program, without affecting the original alpha channel which I have already preserved. I hope this makes enough sense, I am sure it is possible, and if so I should imagine it is rather simple, but this has me stumped. Any help much appreachiated. Cheers, Chris

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  • Good Book for Learning Meteor: Discover Meteor

    - by Stephen.Walther
    A week or so ago, Sacha Greif asked me whether I would be willing to write a review of his new book on Meteor (published today) entitled Discover Meteor. Sacha wrote the book with Tom Coleman. Both Sacha and Tom are very active in the Meteor community – they are responsible for several well-known Meteor packages and projects including Atmosphere, Meteorite, meteor-router and Telescope — so I suspected that their book would be good. If you have not heard of Meteor, Meteor is a new framework for building web applications which is built on top of Node.js. Meteor excels at building a new category of constantly-connected, real-time web applications. It has some jaw-dropping features which I described in a previous blog entry: http://stephenwalther.com/archive/2013/03/18/an-introduction-to-meteor.aspx So, I am super excited about Meteor. Unfortunately, because it is evolving so quickly, learning how to write Meteor applications can be challenging. The official documentation at Meteor.com is good, but it is too basic. I’m happy to report that Discovering Meteor is a really good book: · The book is a fun read. The writing is smooth and I read through the book from cover to cover in a single Saturday afternoon with pleasure. · The book is well organized. It contains a walk-through of building a social media app (Microscope). Interleaved through the app building chapters, it contains tutorial chapters on Meteor features such as deployment and reactivity. · The book covers several advanced topics which I have not seen covered anywhere else. The chapters on publications and subscriptions, routing, and animation are especially good. I came away from the book with a deeper understanding of all of these topics. I wish that I had read Discover Meteor a couple of months ago and it would have saved me several weeks of reading Stack Overflow posts and struggling with the Meteor documentation If you want to buy Discover Meteor, the authors gave me the following link which provides you with a 20% discount: http://discovermeteor.com/orionids

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  • SQL SERVER- Differences Between Left Join and Left Outer Join

    - by pinaldave
    There are a few questions that I had decided not to discuss on this blog because I think they are very simple and many of us know it. Many times, I even receive not-so positive notes from several readers when I am writing something simple. However, assuming that we know all and beginners should know everything is not the right attitude. Since day 1, I have been keeping a small journal regarding questions that I receive in this blog. There are around 200+ questions I receive every day through emails, comments and occasional phone calls. Yesterday, I received a comment with the following question: What are the differences between Left Join and Left Outer Join? Click here to read original comment. This question has triggered the threshold of receiving the same question repeatedly. Here is the answer: There is absolutely no difference between LEFT JOIN and LEFT OUTER JOIN. The same is true for RIGHT JOIN and RIGHT OUTER JOIN. When you use LEFT JOIN keyword in SQL Server, it means LEFT OUTER JOIN only. I have already written in-depth visual diagram discussing the JOINs. I encourage all of you to read the article for further understanding of the JOINs: Read Introduction to JOINs – Basic of JOINs Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Joins, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Async & Await in C# with Xamarin

    - by Wallym
     One of the great things about the .NET Framework is that Microsoft has worked long and hard to improve many features. Since the initial release of .NET 1.0, there has been support for threading via .NET threads as well as an application-level threadpool. This provided a great starting point when compared to Visual Basic 6 and classic ASP programming. The release of.NET 4 brought significant improvements in the area of threading, asynchronous operations and parallel operations. While the improvements made working with asynchronous operations easier, new problems were introduced, since many of these operations work based on callbacks. For example: How should a developer handle error checking? The program flow tends to be non-linear. Fixing bugs can be problematic. It is hard for a developer to get an understanding of what is happening within an application. The release of .NET 4.5 (and C# 5.0), in the fall of 2012, was a blockbuster update with regards to asynchronous operations and threads. Microsoft has added C# language keywords to take this non-linear callback-based program flow and turn it into a much more linear flow. Recently, Xamarin has updated Xamarin.Android and Xamarin.iOS to support async. This article will look at how Xamarin has implemented the .NET 4.5/C# 5 support into their Xamarin.iOS and Xamarin.Android productions. There are three general areas that I'll focus on: A general look at the asynchronous support in Xamarin's mobile products. This includes async, await, and the implications that this has for cross-platform code. The new HttpClient class that is provided in .NET 4.5/Mono 3.2. Xamarin's extensions for asynchronous operations for Android and iOS. FYI: Be aware that sometimes the OpenWeatherMap API breaks, for no reason.  I found this out after I shipped the article in.

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  • Fun with RadCaptcha for ASP.NET AJAX and OCR software

    A friend of mine was evaluating OCR software and finally decided to go with FineReader. I was curious what would happen if we put the RadCaptcha control in. Will the advanced OCR manage to decode it or not? At first he showed me a test run with the RadCaptcha demo description, to get an idea of the basic output:    Naturally, the captured description text was no problem - only a few characters were misread but then corrected with the spellcheck. Next, the real test was performed:    These were only a couple of the results, but there is no need to post the rest of the tests - none of the RadCaptcha images were recognized by the OCR software. Here are the CaptchaImage settings used in the tests: Background Noise Level: Low /default value Line Noise Level: Low /default value Font Warp Factor: Low /Medium is default value...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • How to structure a XML-based order form using ASP.NET

    - by Brendan
    First question here; please help me if I'm doing something wrong. I'm a graphic designer who's trying to teach himself ASP.NET/C#. My server-side background is PHP/WordPress and some ASP Classic, and when I do code I've hand-coded just about everything since I started learning HTML. So, as I've started to learn .NET, my code has been very manual and procedural. I'm now trying to create a really basic order form that pulls from an XML file to populate the form; there's an image, a title, a price, and selectable quantities. If I was making this form as a static HTML file, I'd have each field named manually and so on postback I could query each field to get the values. But I'm trying to do this dynamically so that I can add/remove items from the form and not have to change the code. In terms of displaying the XML, I rolled my own by loading XmlDocument and using XmlNodeList and a bunch of foreach loops to get things displayed. Then, I learned about <asp:XmlDataSource> and <asp:Repeater>, which made displaying the XML simpler by a large margin. However, I've had a really hard time getting the data that's been submitted on postback (it was implied on SO that there are better ways to get data than nested RepeaterItems). So, what I've learned so far is that you can do things a bunch of different ways in .NET. that's why I thought it'd be good to ask for answers regarding the best way to use ASP.NET to display a XML document and dynamically capture the data that's submitted. Any help is appreciated! I'm using Notepad++ to code .NET 2.0.

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