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  • Step-by-step to run a midi keyboard input device? 12.04

    - by Mittenchops
    I have a Korg Nanokey, and I'd like to make it produce sound in ubuntu. I've read that means I should be using Rosegarden, and that Rosegarden uses JACK, but does not install it. (Although checking out Ubuntu Software Center, apparently some components of JACK are installed by default?) I understand there can be a lot of work setting up JACK without it fighting the default sound server. Can someone give me a step-by-step method for what I need to do to plug in my midi machine and hear music when I press keys as simply as possible (without messing up pulseaudio, ie, so I can still access Skype and ordinary desktop stuff)? I'm fine installing JACK, but I'd like to sandbox it a little if it has the chance of messing up regular desktop. I've looked through a couple resources, but I'm not sure what's outdated, but the following looked helpful... http://ubuntuforums.org/showthread.php?t=1686497 http://jackaudio.org/pulseaudio_and_jack

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  • Cannot set a credential for principal 'sa'

    - by hailey
    I was trying to change the SA password on my development server this morning and got an error. Msg 15535, Level 16, State 1, Line 1 Cannot set a credential for principal 'sa'. It was a little frustrating to get an error for a seemingly simple task but then agian maybe I screwed something up.  After doing a couple of searches i found a Microsoft KB (support.microsoft.com/kb/956177) "You receive an exception in SQL Server 2008 when you try to modify the properties of the SQL Server Administrator account by using SQL Server Management Studio".  It was for SQL 2008 but it worked for my SQL 2005 sp3 server just fine.  You have to click the Map to Credential check box but you don't have to add any credetials just click the OK button to complete and that's it.

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  • Symbolic Regular Expression Exploration

    - by Robz / Fervent Coder
    This is a pretty sweet little tool. Rex (Regular Expression Exploration) is a tool that allows you to give it a regular expression and it returns matching strings. The example below creates10 strings that start and end with a number and have at least 2 characters: > rex.exe "^\d.*\d$" /k:10 This is something I could use to validate/generate the Regular Expressions I have created with both UppercuT and RoundhousE. Check out the video below: Margus Veanes - Rex - Symbolic Regular Expression Exploration Margus Veanes, a Researcher from the RiSE group at Microsoft Research, gives an overview of Rex, a tool that generates matching string from .NET regular expressions. Rex turns regular expres...

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  • Advanced donut caching: using dynamically loaded controls

    - by DigiMortal
    Yesterday I solved one caching problem with local community portal. I enabled output cache on SharePoint Server 2007 to make site faster. Although caching works fine I needed to do some additional work because there are some controls that show different content to different users. In this example I will show you how to use “donut caching” with user controls – powerful way to drive some content around cache. About donut caching Donut caching means that although you are caching your content you have some holes in it so you can still affect the output that goes to user. By example you can cache front page on your site and still show welcome message that contains correct user name. To get better idea about donut caching I suggest you to read ScottGu posting Tip/Trick: Implement "Donut Caching" with the ASP.NET 2.0 Output Cache Substitution Feature. Basically donut caching uses ASP.NET substitution control. In output this control is replaced by string you return from static method bound to substitution control. Again, take a look at ScottGu blog posting I referred above. Problem If you look at Scott’s example it is pretty plain and easy by its output. All it does is it writes out current user name as string. Here are examples of my login area for anonymous and authenticated users:    It is clear that outputting mark-up for these views as string is pretty lame to implement in code at string level. Every little change in design will end up with new version of controls library because some parts of design “live” there. Solution: using user controls I worked out easy solution to my problem. I used cache substitution and user controls together. I have three user controls: LogInControl – this is the proxy control that checks which “real” control to load. AnonymousLogInControl – template and logic for anonymous users login area. AuthenticatedLogInControl – template and logic for authenticated users login area. This is the control we render for each user separately because it contains user name and user profile fill percent. Anonymous control is not very interesting because it is only about keeping mark-up in separate file. Interesting parts are LogInControl and AuthenticatedLogInControl. Creating proxy control The first thing was to create control that has substitution area where “real” control is loaded. This proxy control should also be available to decide which control to load. The definition of control is very primitive. <%@ Control EnableViewState="false" Inherits="MyPortal.Profiles.LogInControl" %> <asp:Substitution runat="server" MethodName="ShowLogInBox" /> But code is a little bit tricky. Based on current user instance we decide which login control to load. Then we create page instance and load our control through it. When control is loaded we will call DataBind() method. In this method we evaluate all fields in loaded control (it was best choice as Load and other events will not be fired). Take a look at the code. public static string ShowLogInBox(HttpContext context) {     var user = SPContext.Current.Web.CurrentUser;     string controlName;       if (user != null)         controlName = "AuthenticatedLogInControl.ascx";     else         controlName = "AnonymousLogInControl.ascx";       var path = "~/_controltemplates/" + controlName;     var output = new StringBuilder(10000);       using(var page = new Page())     using(var ctl = page.LoadControl(path))     using(var writer = new StringWriter(output))     using(var htmlWriter = new HtmlTextWriter(writer))     {         ctl.DataBind();         ctl.RenderControl(htmlWriter);     }     return output.ToString(); } When control is bound to data we ask to render it its contents to StringBuilder. Now we have the output of control as string and we can return it from our method. Of course, notice how correct I am with resources disposing. :) The method that returns contents for substitution control is static method that has no connection with control instance because hen page is read from cache there are no instances of controls available. Conclusion As you saw it was not very hard to use donut caching with user controls. Instead of writing mark-up of controls to static method that is bound to substitution control we can still use our user controls.

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  • Bring Gadgets back to Your Desktop in Windows 8 RTM with 8GadgetPack

    - by Asian Angel
    Are you someone who loved using desktop gadgets in Windows 7 and Vista, but felt disappointed when learning they were removed in Windows 8 RTM? Then 8GadgetPack is just the app to put those gadgets back on your desktop! The good folks over at 7 Tutorials have a nice little write-up about 8GadgetPack with all the details you need to get those gadgets up and running once again. Just browse on over using the link below… How to Use Desktop Gadgets in Windows 8 with 8GadgetPack [7 Tutorials] How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • TechDays 2010: What’s New On C# 4.0

    - by Paulo Morgado
    I would like to thank those that attended my session at TechDays 2010 and I hope that I was able to pass the message of what’s new on C#. For those that didn’t attend (or did and want to review it), the presentation can be downloaded from here. Code samples can be downlaoded from here. Here’s a list of resources mentioned on the session: The evolution of C# The Evolution Of C# Covariance and contravariance  C# 4.0: Covariance And Contravariance In Generics Covariance And Contravariance In Generics Made Easy Covarince and Contravariance in Generics Exact rules for variance validity Events get a little overhaul in C# 4, Afterward: Effective Events Named and optional arguments  Named And Optional Arguments Alternative To Optional Arguments Named and Optional Arguments (C# Programming Guide) Dynamic programming  Dynamic Programming C# Proposal: Compile Time Static Checking Of Dynamic Objects Using Type dynamic (C# Programming Guide) Dynamic Language Runtime Overview COM Interop Improvements COM Interop Improvements Type Equivalence and Embedded Interop Types Conclusion Visual C# Developer Center Visual C# 2010 Samples C# Language Specification 4.0 .NET Reflector LINQPad

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  • How to perform regular expression based replacements on files with MSBuild

    - by Daniel Cazzulino
    And without a custom DLL with a task, too . The example at the bottom of the MSDN page on MSBuild Inline Tasks already provides pretty much all you need for that with a TokenReplace task that receives a file path, a token and a replacement and uses string.Replace with that. Similar in spirit but way more useful in its implementation is the RegexTransform in NuGet’s Build.tasks. It’s much better not only because it supports full regular expressions, but also because it receives items, which makes it very amenable to batching (applying the transforms to multiple items). You can read about how to use it for updating assemblies with a version number, for example. I recently had a need to also supply RegexOptions to the task so I extended the metadata and a little bit of the inline task so that it can parse the optional flags. So when using the task, I can pass the flags as item metadata as follows:...Read full article

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  • Friday Fun: Daisy in Wonderland

    - by Asian Angel
    Are you suffering the effects of another grinding week at work? Then it is time for you to relax for a little bit and have some fun! In this week’s game you get to engage in inter-dimensional travel as you help Daisy try to return home Latest Features How-To Geek ETC How To Create Your Own Custom ASCII Art from Any Image How To Process Camera Raw Without Paying for Adobe Photoshop How Do You Block Annoying Text Message (SMS) Spam? How to Use and Master the Notoriously Difficult Pen Tool in Photoshop HTG Explains: What Are the Differences Between All Those Audio Formats? How To Use Layer Masks and Vector Masks to Remove Complex Backgrounds in Photoshop Bring Summer Back to Your Desktop with the LandscapeTheme for Chrome and Iron The Prospector – Home Dash Extension Creates a Whole New Browsing Experience in Firefox KinEmote Links Kinect to Windows Why Nobody Reads Web Site Privacy Policies [Infographic] Asian Temple in the Snow Wallpaper 10 Weird Gaming Records from the Guinness Book

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  • Android programming vs iPhone Programming?

    - by geena
    Hi, I am doing my finol project and thinking of an mobile app to develop.but i am new to mobile OS world and dont know which is good for me to go on.I mean , in long term which will be more beneficial to me b/w android or iPhone programming as well as to my final project ? :) .......... Thanx for all the suggestions of you guyz :) Well I am, if not so bright, then pretty good at Java and C++ :) Although Objective C is a little different from standard C/C++ but I think I can cope with it. Owning a Mac or running Snow Leopard in VMWare is not going to make much difference in iOS development... or is it? Actually, as it is final project for my BS degree, I am wondering whether is it worth taking as a final project or not (iPhone or Android app)...Or.... Is it better to stick with web/desktop development? and what this means that i have to be a

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  • Drawing territories border in 2d map

    - by Gabriel A. Zorrilla
    I'm programming a little web strategy game. In the country map I pretend to display each country with a national color. The issue is how to render the borders in a simple and efficient way. Right now I'm planning to set a field to each tile called "border" with values from 0 to 8. The algorithm would check for EVERY tile is its adjacent has a different "owner". If the tile is inside the territory, the border value would be 0, because would not have adjacent any tile with different owner, if not, would vary between 1 (north) clockwise to 9 (north-west) and then draw the border. I find this simple but too processor-intensive. Are there any other "pro" choices to render territories borders?

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  • It's a Long, Long Way to Tipperary but not that Far to Yak about Apps

    - by linda.fishman.hoyle
    I wanted to let everyone know that my blog URL will be moving to http://blogs.oracle.com/lindafishman/. I will focus my future writings to be about the upgrade and adoption strategies of Oracle E-Business Suite customers. To give you a little preview, here is a link to a book of 60 customers who are live on E-Business Suite Release 12 and 12.1. We have thousands of customers live on Release 12.x and are feverishly trying to write as many stories as we can so those of you who are thinking about upgrading, putting a business case together to move from another ERP application to E-Business Suite or for small and midsize companies who want a better understanding of the benefits E-Business Suite provides organizations of your size, this will be the place to go. See you at the new site! Linda

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  • The Beginner’s Guide to Customizing Your Android Home Screen

    - by Chris Hoffman
    If you’re just getting started with Android, its customizability can seem a bit daunting. We’ll walk you through customizing your Android home-screen, taking advantage of widgets, and getting third-party launchers with more features. The screenshots for this article were taken on Android 4.2. If you’re using an older device, the exact process will look a little different, but you should be able to follow along anyway. Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It How To Delete, Move, or Rename Locked Files in Windows

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  • how to get all programming skills. guys help me to become a good programmer [closed]

    - by Dhananjay
    okay guys i dropped out and now self teaching myself programming.i want to be a good programmer.i downloaded c++ primer plus by stephen prata .i thought its a good book but here many peoples are saying that its not a good book.so please suggest me from where i should start.which books i should read..i know little programming just basic not much.but i want to be expert so please suggest books and also tell that in which pattern i should study as i m free 24 hours.should i only study c++ untill i finsh it or side by side other languages too?from which book did u learned it? give some advises/tips. i want to make my own apps and i want to learn web development also.. thank you ?

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  • Speaking at SQLRelay. Will you be there?

    - by jamiet
    SQL Relay (#sqlrelay) is fast approaching and I wanted to take this opportunity to tell you a little about it.SQL Relay is a 5-day tour around the UK that is taking in five Server Server user groups, each one comprising a full day of SQL Server related learnings. The dates and venues are:21st May, Edinburgh22nd May, Manchester23rd May, Birmingham24th May, Bristol30th May, LondonClick on the appropriate link to see the full agenda and to book your spot.SQL Relay features some of this country's most prominent SQL Server speakers including Chris Webb, Tony Rogerson, Andrew Fryer, Martin Bell, Allan Mitchell, Steve Shaw, Gordon Meyer, Satya Jayanty, Chris Testa O'Neill, Duncan Sutcliffe, Rob Carrol, me and SQL Server UK Product Manager Morris Novello so I really encourage you to go - you have my word it'll be an informative and, more importantly, enjoyable day out from your regular 9-to-5.I am presenting my session "A Lap Around the SSIS Catalog" at Edinburgh and Manchester so if you're going, I hope to see you there.@Jamiet

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  • Custom Upload Advanced Scripting CMS

    - by bradlis7
    I am looking for a specific content management platform that would display themes for my application. Requirements are as folllows: Any user can upload content, but has to be approved by an administrator When the user uploads the content, an external application is called to generate a thumbnail I could create this using codeigniter or something, but I would much prefer to use an existing system. I have experience with Drupal (seems a little bloated for my needs), and Wordpress (I'm using it as main website right now). Maybe I need a plugin for WordPress instead of another CMS. WordPress currently blocks uploads of my file type. I can modify it, but it's a pain to update it every time WordPress has a new release.

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  • Querying Visual Studio project files using T-SQL and Powershell

    - by jamiet
    Earlier today I had a need to get some information out of a Visual Studio project file and in this blog post I’m going to share a couple of ways of going about that because I’m pretty sure I won’t be the only person that ever wants to do this. The specific problem I was trying to solve was finding out how many objects in my database project (i.e. in my .dbproj file) had any warnings suppressed but the techniques discussed below will work pretty well for any Visual Studio project file because every such file is simply an XML document, hence it can be queried by anything that can query XML documents. Ever heard the phrase “when all you’ve got is hammer everything looks like a nail”? Well that’s me with querying stuff – if I can write SQL then I’m writing SQL. Here’s a little noddy database project I put together for demo purposes: Two views and a stored procedure, nothing fancy. I suppressed warnings for [View1] & [Procedure1] and hence the pertinent part my project file looks like this:   <ItemGroup>    <Build Include="Schema Objects\Schemas\dbo\Views\View1.view.sql">      <SubType>Code</SubType>      <SuppressWarnings>4151,3276</SuppressWarnings>    </Build>    <Build Include="Schema Objects\Schemas\dbo\Views\View2.view.sql">      <SubType>Code</SubType>    </Build>    <Build Include="Schema Objects\Schemas\dbo\Programmability\Stored Procedures\Procedure1.proc.sql">      <SubType>Code</SubType>      <SuppressWarnings>4151</SuppressWarnings>    </Build>  </ItemGroup>  <ItemGroup> Note the <SuppressWarnings> elements – those are the bits of information that I am after. With a lot of help from folks on the SQL Server XML forum  I came up with the following query that nailed what I was after. It reads the contents of the .dbproj file into a variable of type XML and then shreds it using T-SQL’s XML data type methods: DECLARE @xml XML; SELECT @xml = CAST(pkgblob.BulkColumn AS XML) FROM   OPENROWSET(BULK 'C:\temp\QueryingProjectFileDemo\QueryingProjectFileDemo.dbproj' -- <-Change this path!                    ,single_blob) AS pkgblob                    ;WITH XMLNAMESPACES( 'http://schemas.microsoft.com/developer/msbuild/2003' AS ns) SELECT  REVERSE(SUBSTRING(REVERSE(ObjectPath),0,CHARINDEX('\',REVERSE(ObjectPath)))) AS [ObjectName]        ,[SuppressedWarnings] FROM   (        SELECT  build.query('.') AS [_node]        ,       build.value('ns:SuppressWarnings[1]','nvarchar(100)') AS [SuppressedWarnings]        ,       build.value('@Include','nvarchar(1000)') AS [ObjectPath]        FROM    @xml.nodes('//ns:Build[ns:SuppressWarnings]') AS R(build)        )q And here’s the output: And that’s it – an easy way of discovering which warnings have been suppressed and for which objects in your database projects. I won’t bother going over the code as it is fairly self-explanatory – peruse it at your leisure.   Once I had the SQL above I figured I’d share it around a little in case it was ever useful to anyone else; hence I’m writing this blog post and I also posted it on the Visual Studio Database Development Tools forum at FYI: Discover which objects have had warnings suppressed. Luckily Kevin Goode saw the thread and he posted a different solution to the same problem, one that uses Powershell. The advantage of Kevin’s Powershell approach is that it is easy to analyse many .dbproj files at the same time. Below is Kevin’s code which I have tweaked ever so slightly so that it produces the same results as my SQL script (I just want any object that had had a warning suppressed whereas Kevin was querying specifically for warning 4151):   cd 'C:\Temp\QueryingProjectFileDemo\' cls $projects = ls -r -i *.dbproj Foreach($project in $projects) { $xml = new-object System.Xml.XmlDocument $xml.set_PreserveWhiteSpace( $true ) $xml.Load($project) #$xpath = @{Start="/e:Project/e:ItemGroup/e:Build[e:SuppressWarnings=4151]/@Include"} #$xpath = @{Start="/e:Project/e:ItemGroup/e:Build[contains(e:SuppressWarnings,'4151')]/@Include"} $xpath = @{Start="/e:Project/e:ItemGroup/e:Build[e:SuppressWarnings]/@Include"} $ns = @{ e = "http://schemas.microsoft.com/developer/msbuild/2003" } $xml | Select-Xml -XPath $xpath.Start -Namespace $ns |Select -Expand Node | Select -expand Value } and here’s the output: Nice reusable Powershell and SQL scripts – not bad for an evening’s work. Thank you to Kevin for allowing me to share his code. Don’t forget that these techniques can easily be adapted to query any Visual Studio project file, they’re only XML documents after all! Doubtless many people out there already have code for doing this but nonetheless here is another offering to the great script library in the sky. Have fun! @Jamiet

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  • The PASS Elections Review Committee Needs Your Feedback

    - by andyleonard
    Introduction PASS has had an ERC (Elections Review Committee) forum running for a few months now. There's been surprisingly little feedback, though lots of reads. Here's what it looks like tonight: That's 1,662 views and 37 replies by my count. Not very many replies... Jump In! Now's the time to let PASS know what you think about the current elections process. The ERC members are good people who are trying to make things better. If you have something to add - as simple as "love it!" or "hate it!"...(read more)

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  • Chess as a team building exercise for software developers

    - by maple_shaft
    The last place I worked wasn't a particularly great place and there were more than a few nights where we were working late into the evening trying to meet our sprints. The team while stressed out got pretty close and people started bringing in little mind teasers and puzzles, just something we would all play around with and try to solve while a build/deploy was running for the test environment, or while we were waiting for the integration test run to finish. Eventually it turned into people bringing chess boards in and setting them at their desks. We would play by email sending each other moves in chess notation, but at a very casual pace, with games lasting sometimes two or three days. Management tolerated this when we were putting in overtime, but as things were being managed better and people weren't working much more than 40/wk, they started cracking down on this and told us that we weren't allowed to have chess boards at our desks, although they were okay with the puzzle games. What are the pros and cons in your opinion of allowing chess during software development lull time?

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  • Oracle India: Become an Oracle Student Ambassador

    - by user769227
     As the new year begins in India for many students, Oracle India is currently looking for bright, energetic students who are interested in becoming Oracle Campus Ambassadors. We have a dedicated team of Campus Recruiters who are regularly on site at selected Engineering Colleges in India - we need your help to spread the Oracle message within the Student Community. This is a great chance to work with one of the global leaders in the IT space and get some exposure to Oracle that many people do not get the chance to experience We are specifically looking for Campus Ambassadors at these colleges:   IIT Kanpur IIT Delhi  IIT  Madras  IIT Kharagpur  IIT Kharagpur  IIT Bombay  IIT Guwahati  IT-BHU  BITS Pilani  BITS Goa  IISc Bangalore  Do you want to find out more? Have a read of the Infographic we have created below that will talk a little about what an 'Oracle Ambassador' actually will do. If you are interested in this fantastic opportunity and meet the eligibility criteria send us your resume at [email protected] We are excited for another great school and we are looking forward to sharing that experience with you.

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  • Windows Azure End to End Examples

    - by BuckWoody
    I’m fascinated by the way people learn. I’m told there are several methods people use to understand new information, from reading to watching, from experiencing to exploring. Personally, I use multiple methods of learning when I encounter a new topic, usually starting with reading a bit about the concepts. I quickly want to put those into practice, however, especially in the technical realm. I immediately look for examples where I can start trying out the concepts. But I often want a “real” example – not just something that represents the concept, but something that is real-world, showing some feature I could actually use. And it’s no different with the Windows Azure platform – I like finding things I can do now, and actually use. So when I started learning Windows Azure, I of course began with the Windows Azure Training Kit – which has lots of examples and labs, presentations and so on. But from there, I wanted more examples I could learn from, and eventually teach others with. I was asked if I would write a few of those up, so here are the ones I use. CodePlex CodePlex is Microsoft’s version of an “Open Source” repository. Anyone can start a project, add code, documentation and more to it and make it available to the world, free of charge, using various licenses as they wish. Microsoft also uses this location for most of the examples we publish, and sample databases for SQL Server. If you search in CodePlex for “Azure”, you’ll come back with a list of projects that folks have posted, including those of us at Microsoft. The source code and documentation are there, so you can learn using actual examples of code that will do what you need. There’s everything from a simple table query to a full project that is sort of a “Corporate Dropbox” that uses Windows Azure Storage. The advantage is that this code is immediately usable. It’s searchable, and you can often find a complete solution to meet your needs. The disadvantage is that the code is pretty specific – it may not cover a huge project like you’re looking for. Also, depending on the author(s), you might not find the documentation level you want. Link: http://azureexamples.codeplex.com/site/search?query=Azure&ac=8    Tailspin Microsoft Patterns and Practices is a group here that does an amazing job at sharing standard ways of doing IT – from operations to coding. If you’re not familiar with this resource, make sure you read up on it. Long before I joined Microsoft I used their work in my daily job – saved a ton of time. It has resources not only for Windows Azure but other Microsoft software as well. The Patterns and Practices group also publishes full books – you can buy these, but many are also online for free. There’s an end-to-end example for Windows Azure using a company called “Tailspin”, and the work covers not only the code but the design of the full solution. If you really want to understand the thought that goes into a Platform-as-a-Service solution, this is an excellent resource. The advantages are that this is a book, it’s complete, and it includes a discussion of design decisions. The disadvantage is that it’s a little over a year old – and in “Cloud” years that’s a lot. So many things have changed, improved, and have been added that you need to treat this as a resource, but not the only one. Still, highly recommended. Link: http://msdn.microsoft.com/en-us/library/ff728592.aspx Azure Stock Trader Sometimes you need a mix of a CodePlex-style application, and a little more detail on how it was put together. And it would be great if you could actually play with the completed application, to see how it really functions on the actual platform. That’s the Azure Stock Trader application. There’s a place where you can read about the application, and then it’s been published to Windows Azure – the production platform – and you can use it, explore, and see how it performs. I use this application all the time to demonstrate Windows Azure, or a particular part of Windows Azure. The advantage is that this is an end-to-end application, and online as well. The disadvantage is that it takes a bit of self-learning to work through.  Links: Learn it: http://msdn.microsoft.com/en-us/netframework/bb499684 Use it: https://azurestocktrader.cloudapp.net/

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  • Should I avoid SharePoint Development in Visual Studio?

    - by SaphuA
    Hello, Not long ago I started an internship at a company that supplies SharePoint consultancy, hosting and development. While their consultancy seems to be pretty good and solid, I feel their development department lacks direction. The reason for this, most likely, is that they stopped outsourcing not too long ago. One thing that I've frequently bumped my head into is the following: My supervisor strongly insists that everything that can be done natively in SharePoint (somehow this includes editing xslt files in Designer) should be done in SharePoint. Even if this results in longer development time (at least when they make me write XSLT) and reduced usability. Her main arguments for this are: Better maintainability Editing the functionality doesn't require programming knowledge I feel the company is a little biassed and I am unable to get a decent discussion going. This is why I am looking for other places to get some responses on the subject (and not only on the arguments of my supervisor, but more on the subject in general). Kind regards

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  • Allowing Access to HttpContext in WCF REST Services

    - by Rick Strahl
    If you’re building WCF REST Services you may find that WCF’s OperationContext, which provides some amount of access to Http headers on inbound and outbound messages, is pretty limited in that it doesn’t provide access to everything and sometimes in a not so convenient manner. For example accessing query string parameters explicitly is pretty painful: [OperationContract] [WebGet] public string HelloWorld() { var properties = OperationContext.Current.IncomingMessageProperties; var property = properties[HttpRequestMessageProperty.Name] as HttpRequestMessageProperty; string queryString = property.QueryString; var name = StringUtils.GetUrlEncodedKey(queryString,"Name"); return "Hello World " + name; } And that doesn’t account for the logic in GetUrlEncodedKey to retrieve the querystring value. It’s a heck of a lot easier to just do this: [OperationContract] [WebGet] public string HelloWorld() { var name = HttpContext.Current.Request.QueryString["Name"] ?? string.Empty; return "Hello World " + name; } Ok, so if you follow the REST guidelines for WCF REST you shouldn’t have to rely on reading query string parameters manually but instead rely on routing logic, but you know what: WCF REST is a PITA anyway and anything to make things a little easier is welcome. To enable the second scenario there are a couple of steps that you have to take on your service implementation and the configuration file. Add aspNetCompatibiltyEnabled in web.config Fist you need to configure the hosting environment to support ASP.NET when running WCF Service requests. This ensures that the ASP.NET pipeline is fired up and configured for every incoming request. <system.serviceModel>     <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" /> </system.serviceModel> Markup your Service Implementation with AspNetCompatibilityRequirements Attribute Next you have to mark up the Service Implementation – not the contract if you’re using a separate interface!!! – with the AspNetCompatibilityRequirements attribute: [ServiceContract(Namespace = "RateTestService")] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] public class RestRateTestProxyService Typically you’ll want to use Allowed as the preferred option. The other options are NotAllowed and Required. Allowed will let the service run if the web.config attribute is not set. Required has to have it set. All these settings determine whether an ASP.NET host AppDomain is used for requests. Once Allowed or Required has been set on the implemented class you can make use of the ASP.NET HttpContext object. When I allow for ASP.NET compatibility in my WCF services I typically add a property that exposes the Context and Request objects a little more conveniently: public HttpContext Context { get { return HttpContext.Current; } } public HttpRequest Request { get { return HttpContext.Current.Request; } } While you can also access the Response object and write raw data to it and manipulate headers THAT is probably not such a good idea as both your code and WCF will end up writing into the output stream. However it might be useful in some situations where you need to take over output generation completely and return something completely custom. Remember though that WCF REST DOES actually support that as well with Stream responses that essentially allow you to return any kind of data to the client so using Response should really never be necessary. Should you or shouldn’t you? WCF purists will tell you never to muck with the platform specific features or the underlying protocol, and if you can avoid it you definitely should avoid it. Querystring management in particular can be handled largely with Url Routing, but there are exceptions of course. Try to use what WCF natively provides – if possible as it makes the code more portable. For example, if you do enable ASP.NET Compatibility you won’t be able to self host a WCF REST service. At the same time realize that especially in WCF REST there are number of big holes or access to some features are a royal pain and so it’s not unreasonable to access the HttpContext directly especially if it’s only for read-only access. Since everything in REST works of URLS and the HTTP protocol more control and easier access to HTTP features is a key requirement to building flexible services. It looks like vNext of the WCF REST stuff will feature many improvements along these lines with much deeper native HTTP support that is often so useful in REST applications along with much more extensibility that allows for customization of the inputs and outputs as data goes through the request pipeline. I’m looking forward to this stuff as WCF REST as it exists today still is a royal pain (in fact I’m struggling with a mysterious version conflict/crashing error on my machine that I have not been able to resolve – grrrr…).© Rick Strahl, West Wind Technologies, 2005-2011Posted in ASP.NET  AJAX  WCF  

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  • What is your favorite Software Engineering methodology?

    - by bmdhacks
    I'm hoping the SO crowd can help me expand my definitions of methodology buzzwords such as SCRUM, Agile, XP, Waterfall, etc, and give some enlightenment as to which approach is the best. If there's some specific book or web page that really captures your philosophy on constructing software with teams of programmers, please indicate it. EDIT: Please don't say, "I use a little of everything." without any more detail. If you haven't read any books or websites that have been helpful, now's your chance to enlighten the world by describing your experience-learned methodology. I would encourage the moderators to up-vote more descriptive answers. It's OK if you haven't read any books and made up your own style from experience, but please describe that style so we can learn from you. Thanks for taking the time to answer my question.

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  • Chrome Apps Office Hours: Networking APIs

    Chrome Apps Office Hours: Networking APIs Ask and vote for questions at goo.gl Writing a web server in a web browser is a little meta, but it's one of the many new scenarios unlocked by the new APIs available in Chrome Apps! Join Paul Kinlan and Pete LePage as they explore the networking APIs available to Chrome Apps. They'll show you how you you can write your own web server, and connect to other devices via the network. While the web server in a browser may not be a common scenario, accessing the TCP and UDP stack is extremely powerful and will allow your apps to connect to other hardware or services like never before. From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • Pac-Man Hiding Spot Makes High Scores a Snap

    - by Jason Fitzpatrick
    This interesting bug (feature?) in the original Pac-Man game makes it easy to hide from the ghosts, ensuring a long-lived and well-fed Pac-Man. Check out the video above to see the black hole you can park Pac-Man in to avoid assault by the ghosts. There’s two big caveats with this trick: first, it only works in the original game (spin offs and modern adaptations won’t necessarily have it but the original machine and MAME implementations of it will). Second, it doesn’t work if the ghosts see you park yourself there; you need to slip into the spot our of their direct line of sight. Still craving more Pac-Man goodness? Check out these cheat maps that map out all the patterns you need to follow to sneak through every level unmolested by ghosts. [via Neatorama] How To Be Your Own Personal Clone Army (With a Little Photoshop) How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume

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