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  • Using JQuery tabs in an HTML 5 page

    - by nikolaosk
    In this post I will show you how to create a simple tabbed interface using JQuery,HTML 5 and CSS.Make sure you have downloaded the latest version of JQuery (minified version) from http://jquery.com/download.Please find here all my posts regarding JQuery.Also have a look at my posts regarding HTML 5.In order to be absolutely clear this is not (and could not be) a detailed tutorial on HTML 5. There are other great resources for that.Navigate to the excellent interactive tutorials of W3School.Another excellent resource is HTML 5 Doctor.Two very nice sites that show you what features and specifications are implemented by various browsers and their versions are http://caniuse.com/ and http://html5test.com/. At this times Chrome seems to support most of HTML 5 specifications.Another excellent way to find out if the browser supports HTML 5 and CSS 3 features is to use the Javascript lightweight library Modernizr.In this hands-on example I will be using Expression Web 4.0.This application is not a free application. You can use any HTML editor you like.You can use Visual Studio 2012 Express edition. You can download it here. Let me move on to the actual example.This is the sample HTML 5 page<!DOCTYPE html><html lang="en">  <head>    <title>Liverpool Legends</title>    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" >    <link rel="stylesheet" type="text/css" href="style.css">    <script type="text/javascript" src="jquery-1.8.2.min.js"> </script>     <script type="text/javascript" src="tabs.js"></script>       </head>  <body>    <header>        <h1>Liverpool Legends</h1>    </header>     <section id="tabs">        <ul>            <li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=9143136#first-tab">Defenders</a></li>            <li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=9143136#second-tab">Midfielders</a></li>            <li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=9143136#third-tab">Strikers</a></li>        </ul>   <div id="first-tab">     <h3>Liverpool Defenders</h3>     <p> The best defenders that played for Liverpool are Jamie Carragher, Sami Hyypia , Ron Yeats and Alan Hansen.</p>   </div>   <div id="second-tab">     <h3>Liverpool Midfielders</h3>     <p> The best midfielders that played for Liverpool are Kenny Dalglish, John Barnes,Ian Callaghan,Steven Gerrard and Jan Molby.        </p>   </div>   <div id="third-tab">     <h3>Liverpool Strikers</h3>     <p>The best strikers that played for Liverpool are Ian Rush,Roger Hunt,Robbie Fowler and Fernando Torres.<br/>      </p>   </div> </div></section>            <footer>        <p>All Rights Reserved</p>      </footer>     </body>  </html>  This is very simple HTML markup. I have styled this markup using CSS.The contents of the style.css file follow* {    margin: 0;    padding: 0;}header{font-family:Tahoma;font-size:1.3em;color:#505050;text-align:center;}#tabs {    font-size: 0.9em;    margin: 20px 0;}#tabs ul {    float: left;    background: #777;    width: 260px;    padding-top: 24px;}#tabs li {    margin-left: 8px;    list-style: none;}* html #tabs li {    display: inline;}#tabs li, #tabs li a {    float: left;}#tabs ul li.active {    border-top:2px red solid;    background: #15ADFF;}#tabs ul li.active a {    color: #333333;}#tabs div {    background: #15ADFF;    clear: both;    padding: 15px;    min-height: 200px;}#tabs div h3 {    margin-bottom: 12px;}#tabs div p {    line-height: 26px;}#tabs ul li a {    text-decoration: none;    padding: 8px;    color:#0b2f20;    font-weight: bold;}footer{background-color:#999;width:100%;text-align:center;font-size:1.1em;color:#002233;}There are some CSS rules that style the various elements in the HTML 5 file. These are straight-forward rules. The JQuery code lives inside the tabs.js file $(document).ready(function(){$('#tabs div').hide();$('#tabs div:first').show();$('#tabs ul li:first').addClass('active'); $('#tabs ul li a').click(function(){$('#tabs ul li').removeClass('active');$(this).parent().addClass('active');var currentTab = $(this).attr('href');$('#tabs div').hide();$(currentTab).show();return false;});}); I am using some of the most commonly used JQuery functions like hide , show, addclass , removeClass I hide and show the tabs when the tab becomes the active tab. When I view my page I get the following result Hope it helps!!!!!

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  • Best Open Source Java CMS

    - by LuRsT
    I'm trying to find a good Java cms, I've stumbled uppon some that are quite good like: Apache Lenya, dotCMS, Info Glue, Open Edit, MMBase, Contelligent, Hippo CMS Which on do you guys recommend, or even one that I'm missing, because I have some more that I am studying at the moment. The requirements are that I can build modules for it with ease, and that it is open source and free, and with LDAP support. The problem is that I'm not that into Java in web, that's why I'm having trouble finding a good one. One Java cms like dotNetNuke would be the best. Edit: Jahia is off the list because it has no suport for LDAP (community version) Thanks!

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  • ODBC datasource for DB2 on 64 bit Windows 2008

    - by Rob Vermeulen
    First of all, sorry for this non-programming question. I just finished development of some code that communicates with DB2 and want to test/deploy it on a Windows 2008 machine. I'm a bit concerned about not being able to find a working ODBC datasource (DSN/client) driver for DB2 on Windows 2008 (x64). I have a 32-bit driver for XP but that one (obviously) won't install on 2008-64. The IBM web site comes up with 1844 results when searching for "ODBC Windows 2008", but none of them are relevant. The web site's also a pain to use, btw. While googling around I found some solutions by 3rd party vendors but they all want money :) And the DB2 client and ODBC driver from IBM have always been free-of-charge. Does anyone have a solution?

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  • Shorten array length once element is remove in Java.

    - by lupin
    Note: Following is my homework/assignment, feel free not to answer if you will. I want to delete/remove an element from an String array(Set) basic, I'm not allowed to use Collections..etc. Now I have this: void remove(String newValue) { for ( int i = 0; i < setElements.length; i++) { if ( setElements[i] == newValue ) { setElements[i] = ""; } } } I does what I want as it remove the element from an array but it doesn't shorten the length. The following is the output, basically it remove the element indexed #1. D:\javaprojects>java SetsDemo Enter string element to be added A You entered A Set size is: 5 Member elements on index: 0 A Member elements on index: 1 b Member elements on index: 2 hello Member elements on index: 3 world Member elements on index: 4 six Set size is: 5 Member elements on index: 0 A Member elements on index: 1 Member elements on index: 2 hello Member elements on index: 3 world Member elements on index: 4 six lupin

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  • HTML + CSS dynamic render in flash?

    - by Ole Jak
    I have HTML + CSS text. I need some lib with simple function like "Render String Var conteining HTML" So no external files (like in flash lib called HTMLwraper you just have to play your SWF on top of HTML). dinamic! I give it string it renders It into some conteiner (not as a bitmab but as if it was real HTML dynamically rendered in flash). (And I need real HTML + CSS support not what normal rich text block gives us) I am going to use it in with Flex (Flash Builder) so I like MXML component model but even pure flash AS3 will workout. It should be Free and Opensource (any license like GPL, LGPL etc will be ok). So Is out there such flash\flex library for HTML + CSS dynamic rendering (rfom given String or XML)?

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  • Must have JavaScript pro developer tools, libs, utilities and workshop configuration.

    - by WooYek
    This is a followup question to the Pro JavaScript programmer interview questions (with answers). What is considered professional and industrial standard for a professional browser side Java Script developer when it comes to his workshop configuration, and maybe from-concept-to-shipment process? What are the most popular IDE's, utilities and probably libraries, not limited to the free ones. These that can help cut development time (eg. IDE), help with achieve better quality (eg. unit testing tools), reliability and maintainability. I'm looking for a baseline to which I could compare potential candidates based on their ability to keep their tools sharp and workshop efficient (pro's should invest time&money in good tools, right?).

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  • DotnetNuke redirect

    - by X-Dev
    our client needs to shortcuts to particular pages We need to redirect non existent urls like http://site.com/promotion1 to the actual URL similar to http://site.com/promotions/promotion1/tabid/799/language/en-AU/Default.aspx ... I've sent a list of appropriate DNN modules to our client but it may take them forever to get back to me. In the mean time they still submitting requests to us to create redirects for them. if there's no cost involved then i wont have to wait for them to get back to me. so I'm looking for a Quick and free way to enable the clients to set these up on this own. I've looked at: http://www.snowcovered.com/snowcovered2/Default.aspx?tabid=242&PackageID=3302 http://www.ventrian.com/Resources/Projects/FriendlyUrls.aspx http://www.codeproject.com/kb/aspnet/dnn2url_rewrite.aspx But haven't had much luck in the small amount of time i have available. Has anyone got some suggestions on how to achieve our goal with either the above resources or maybe some additional resource i haven't found yet? (DNN v4.9)

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  • Where can I get resources for developing for Mac OS Classic?

    - by Benjamin Pollack
    I recently got bored and fired up my old Mac OS Classic emulator, and then got nostalgic for writing old-school applications for the system. So, my question: Where can I get dev tools that can still target Classic? (Ideally free, since this is just for fun, but if grabbing a used version of CodeWarrior on eBay is the best way to go, so be it.) Where can I get at least reference materials so I don't have to guess-and-check my way around Carbon/the System Toolbox? Are there any forums still running that would be open to answering old-school Mac questions for when I get stuck? This is purely for fun, so don't worry about how impractical this is. I know.

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  • Simple .NET webcam library

    - by Vegard Larsen
    Is there a simple library for .NET that has a simply API that let's you do something like; // pseudo-code List<Webcam> cams = Webcam.GetAll(); Image i = cams[0].GrabImage(); I've looked at DirectShow and WIA, both seem to be much more complicated than this. I've also looked at this CodeProject project, but it really is much more complicated than what I need. The library should support image grabbing and video grabbing, and preferably live streaming of video. Edit: It is preferable if it is free (or at least very cheap), as this is a hobby project.

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  • 3D Character/Model Creator

    - by Click Ok
    I'm in a project to create a 3d game using XNA/C#, and the game will use a lot of 3d characters. Looking at the current 3d games, in some they create near to hundreds of characters, what lead me to think that there are some good 3d character/model creator. To narrow the sample, the game will have characters like the game "Grand Chase". There are some good (and easy) character model creator for to use in XNA development? Free is better, of course, but I will get payed versions too. EDIT: Another question is about the movements of the characters. The movements like walk, jump, sit, etc are "created" by the "character creator tool" or by the game?

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  • Reading multiple files with PHPExcel

    - by KaOSoFt
    Hello there. I just recently started using this library (the one from CodePlex), but I ran into some issues. My goal is to use it so I can process some data from multiple Excel files, and send such data to a database, per file. I'm doing something like: foreach( $file_list as $file ) { $book = PHPExcel_IOFactory::load( $path . $file ); } So, inside the foreach I'm (for now) just showing the data to the user, but after five files, I get a memory error: Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 50688 bytes) in /var/www/test/classes/PHPExcel/Shared/OLERead.php on line 76 Is there a way to __destruct the object after each file is loaded, so space is reserved (made free) for the next file, instead of accumulating it, or do you rather know of a reason and work-around for this? Please let me know any suggestions you have. Thanks in advance.

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  • Do you know any alternative to NDepend for architects?

    - by ifesdjeen
    Hi! do you know any software similar to NDepend? I've got it just recently, and found it very useful. It helped me a lot, but for now i don't have a possibility to buy a proffessional version. So, is there any alternative (maybe, open-source)? Preferrably, free. But not necessarily. Maybe, with a little bit more fitting price for a single-developer, not a team. Requirements for this software: Build dependency diagrams Retrieve code metrics Display comments coverage (so far)

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  • SQL SERVER – Weekly Series – Memory Lane – #034

    - by Pinal Dave
    Here is the list of selected articles of SQLAuthority.com across all these years. Instead of just listing all the articles I have selected a few of my most favorite articles and have listed them here with additional notes below it. Let me know which one of the following is your favorite article from memory lane. 2007 UDF – User Defined Function to Strip HTML – Parse HTML – No Regular Expression The UDF used in the blog does fantastic task – it scans entire HTML text and removes all the HTML tags. It keeps only valid text data without HTML task. This is one of the quite commonly requested tasks many developers have to face everyday. De-fragmentation of Database at Operating System to Improve Performance Operating system skips MDF file while defragging the entire filesystem of the operating system. It is absolutely fine and there is no impact of the same on performance. Read the entire blog post for my conversation with our network engineers. Delay Function – WAITFOR clause – Delay Execution of Commands How do you delay execution of the commands in SQL Server – ofcourse by using WAITFOR keyword. In this blog post, I explain the same with the help of T-SQL script. Find Length of Text Field To measure the length of TEXT fields the function is DATALENGTH(textfield). Len will not work for text field. As of SQL Server 2005, developers should migrate all the text fields to VARCHAR(MAX) as that is the way forward. Retrieve Current Date Time in SQL Server CURRENT_TIMESTAMP, GETDATE(), {fn NOW()} There are three ways to retrieve the current datetime in SQL SERVER. CURRENT_TIMESTAMP, GETDATE(), {fn NOW()} Explanation and Comparison of NULLIF and ISNULL An interesting observation is NULLIF returns null if it comparison is successful, whereas ISNULL returns not null if its comparison is successful. In one way they are opposite to each other. Here is my question to you - How to create infinite loop using NULLIF and ISNULL? If this is even possible? 2008 Introduction to SERVERPROPERTY and example SERVERPROPERTY is a very interesting system function. It returns many of the system values. I use it very frequently to get different server values like Server Collation, Server Name etc. SQL Server Start Time We can use DMV to find out what is the start time of SQL Server in 2008 and later version. In this blog you can see how you can do the same. Find Current Identity of Table Many times we need to know what is the current identity of the column. I have found one of my developers using aggregated function MAX () to find the current identity. However, I prefer following DBCC command to figure out current identity. Create Check Constraint on Column Some time we just need to create a simple constraint over the table but I have noticed that developers do many different things to make table column follow rules than just creating constraint. I suggest constraint is a very useful concept and every SQL Developer should pay good attention to this subject. 2009 List Schema Name and Table Name for Database This is one of the blog post where I straight forward display script. One of the kind of blog posts, which I still love to read and write. Clustered Index on Separate Drive From Table Location A table devoid of primary key index is called heap, and here data is not arranged in a particular order, which gives rise to issues that adversely affect performance. Data must be stored in some kind of order. If we put clustered index on it then the order will be forced by that index and the data will be stored in that particular order. Understanding Table Hints with Examples Hints are options and strong suggestions specified for enforcement by the SQL Server query processor on DML statements. The hints override any execution plan the query optimizer might select for a query. 2010 Data Pages in Buffer Pool – Data Stored in Memory Cache One of my earlier year article, which I still read it many times and point developers to read it again. It is clear from the Resultset that when more than one index is used, datapages related to both or all of the indexes are stored in Memory Cache separately. TRANSACTION, DML and Schema Locks Can you create a situation where you can see Schema Lock? Well, this is a very simple question, however during the interview I notice over 50 candidates failed to come up with the scenario. In this blog post, I have demonstrated the situation where we can see the schema lock in database. 2011 Solution – Puzzle – Statistics are not updated but are Created Once In this example I have created following situation: Create Table Insert 1000 Records Check the Statistics Now insert 10 times more 10,000 indexes Check the Statistics – it will be NOT updated Auto Update Statistics and Auto Create Statistics for database is TRUE Now I have requested two things in the example 1) Why this is happening? 2) How to fix this issue? Selecting Domain from Email Address This is a straight to script blog post where I explain how to select only domain name from entire email address. Solution – Generating Zero Without using Any Numbers in T-SQL How to get zero digit without using any digit? This is indeed a very interesting question and the answer is even interesting. Try to come up with answer in next 10 minutes and if you can’t come up with the answer the blog post read this post for solution. 2012 Simple Explanation and Puzzle with SOUNDEX Function and DIFFERENCE Function In simple words - SOUNDEX converts an alphanumeric string to a four-character code to find similar-sounding words or names. DIFFERENCE function returns an integer value. The  integer returned is the number of characters in the SOUNDEX values that are the same. Read Only Files and SQL Server Management Studio (SSMS) I have come across a very interesting feature in SSMS related to “Read Only” files. I believe it is a little unknown feature as well so decided to write a blog about the same. Identifying Column Data Type of uniqueidentifier without Querying System Tables How do I know if any table has a uniqueidentifier column and what is its value without using any DMV or System Catalogues? Only information you know is the table name and you are allowed to return any kind of error if the table does not have uniqueidentifier column. Read the blog post to find the answer. Solution – User Not Able to See Any User Created Object in Tables – Security and Permissions Issue Interesting question – “When I try to connect to SQL Server, it lets me connect just fine as well let me open and explore the database. I noticed that I do not see any user created instances but when my colleague attempts to connect to the server, he is able to explore the database as well see all the user created tables and other objects. Can you help me fix it?” Importing CSV File Into Database – SQL in Sixty Seconds #018 – Video Here is interesting small 60 second video on how to import CSV file into Database. ColumnStore Index – Batch Mode vs Row Mode Here is the logic behind when Columnstore Index uses Batch Mode and when it uses Row Mode. A batch typically represents about 1000 rows of data. Batch mode processing also uses algorithms that are optimized for the multicore CPUs and increased memory throughput. Follow up – Usage of $rowguid and $IDENTITY This is an excellent follow up blog post of my earlier blog post where I explain where to use $rowguid and $identity.  If you do not know the difference between them, this is a blog with a script example. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Memory Lane, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Concerns about reading a file in Flash 10

    - by user246114
    Hi, I'd like to read an xml file on a user's machine (which can be kind of large). There's no point in me sending the file to my server as I can do all the work I need on the file right on the client's machine. Not sure if this is a good fit though, was wondering if anyone can answer these questions before I dive in: I see at adobe's website that Flash 10 has like 94% penetration, is this true, I thought it was just released not too long ago? After opening the xml file in flash, is it possible to just throw it to a javascript function on my same page for further processing? I'd like to go into flash world for as short a time as possible. Is it at all common to use flash for file upload stuff? I heard aol/flickr are? I would need to buy flash in order to do this right, they don't have a free ide/compiler yet? Thanks

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  • Stress Test tool for Password Protected Website

    - by Jason
    We need to run a stress test on a password protection section of a website we host. What tool (paid or free) would be best for us to use for this? We'd like to be able to create several 'scripts' and then have the stress test simulate X number of users. Each script will have us login as a specific user and then click on some links and submit forms to simulate an actual user. Ideally the software would also create some nice data exports/charts. Server is a linux web server, but we could run this on linux or Windows so software that will run on either is fine.

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  • Are All Dynamic Languages Typo-friendly?

    - by yar
    With Java on one side and Ruby/Groovy on the other, I know that in the second camp I'm free to make typos which will not get caught until run-time. Is this true of all dynamically-typed languages? Edit: I've been asked to elaborate on the type of typo. In Ruby and in Groovy, you can assign to a variable with an accidental name that is never read. You can call methods that don't exist (obviously your tests should catch this, it's been said). You can refer to classes that don't exist, etc. etc. Basically any valid syntax, even with typographical errors, is valid in both Ruby and Groovy.

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  • avoid dialog box when netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); is

    - by ganapati
    Hi i got to create.write,read a local file within the javascript using XPCom. For that i have included the below line at the beginning of javascript. netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); But when the above script executes, a dialog box appears saying **Internet security** A script from "file://" is requesting enhanced abilities that are UNSAFE and could be used to compromise your machine or data: Run or install software on your machine Allow these abilities only if you trust this source to be free of viruses or malicious programs. ______ _______ | Deny | | Allow | -------- --------- But i dont want the dialog box to be appeared.How can i avoid it?. Thanks.

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  • c# memory allocation and deallocation patterns

    - by Neal
    Since C# uses Garbage Collection. When is it necessary to use .Dispose to free the memory? I realize there are a few situations so I'll try to list the ones I can think of. If I close a Form that contains GUI type object, are those objects dereferenced and therefore will be collected? If I create a local object using new should I .Dispose of it before the method exits or just let the GC take care of it? What is good practice in this case? Are there any times in which forcing a GC is understandable? Are events collected by the GC when it's object is collected?

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  • Higher than high-level web frameworks or CMS's?

    - by Ben
    I'm looking for options that allow very high-level web site development with these special characteristics: not requiring the user to program in a complex programming language not requiring the user to use GUI-like administration areas allow the user to "program" in a lightweight markup language The last point is not only about look and structure of the output but also about creating simple dynamic output. For example: listing pages fetching the content of other pages doing a site search and displaying its output dynamically show or hide parts of the page depending on login status Of course, I am not expecting a solution that provides the same possibilities like a Ruby, Python or PHP web framework. Rather I am looking for support of the "basics" that are common for web sites. Until now, I have found only one piece of software that fulfills these requirements but while it's free, it's not open source: BoltWire at http://www.boltwire.com/. Being open source is required.

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  • can you help me with 8068 project for Delphi .net please

    - by Lex Dean
    To find an Assembly programmer is very hard to help me I'm a established Delphi programmer that has an old copy of Delphi that is not .net And I have a *.dll that I'm converting into Delphi code for .net I'm on a big learning curve hear as i know little of .net yet. I've just got a computer with .net today!!!!!! I've run the *.dll through a dissembler and started putting jump links in as writing in Delphi assembly you do not do any addressing, just reference links. The file has fixed string structures (i think C++) ASCII & ANSI strings 1/ I do not know how to identify how the code references these structures 2/ and I do not know were the functions begin and what shape they look like The code is free for any one to look at their is not many functions in it. but I have to email it as stack over flow will not allow me to display it. Can you tech me or can you refer me to a friend you may know please to tech me lexdeanair at hotmail.com Best regards, Lex Dean from New Zealand I do not wish to pester any one

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  • Best Practices: How can admin deploy software to 100s of PC ?

    - by Gopal
    Hi ... The Environment: I am working for a college. We have a couple of labs (about 100 PCs) for students. At the end of the semester, the PCs will be full of viruses, corrupt system files, all sorts of illegal downloads etc. (everything you can expect from a student environment). At the end of the semester, we would like to wipe out all the systems and do a clean install (WindowsXP + a set of application suites) to get ready for the next batch of students. Question: Is there any free software that will enable an admin to deploy a clean disk image to all the PCs in one go?

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  • Better to build or buy a compute grid platform?

    - by James B
    I am looking to do some quite processor-intensive brute force processing for string matching. I have run my prototype in a multi-threaded environment and compared the performance to an implementation using Gridgain with a couple of nodes (also multithreaded). The performance I observed was that my Gridgain implementation performed slower to my multithreaded implementation. It could be the case that there was a flaw in my gridgain implementation, but it was only a prototype, and I thought the results were indicative. So my question is this: What are the advantages of having to learn and then build an implementation for a particular grid platform (hadoop, gridgain, or EC2 if going hosted - other suggestions welcome), when one could fairly easily put together a lightweight compute grid platform with a much shallower learning curve?...i.e. what do we get for free with these cloud/grid platforms that are worth having/tricky to implement? (Please note, I don't have any need for a data grid) Cheers, -James (p.s. Happy to make this community wiki if needbe)

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  • Tuning OS X Virtual Memory

    - by dcolish
    I've noticed some really odd results form vm_stat on OSX 10.6. According to this, its barely hitting the cache. Searches of pretty much everywhere I could think of turn up little to explain why the rate is so low. I asked a few friends and they're seeing the same thing. What gives and how can I make it better? Mach Virtual Memory Statistics: (page size of 4096 bytes) Pages free: 78609. Pages active: 553411. Pages inactive: 191116. Pages speculative: 6198. Pages wired down: 153998. "Translation faults": 116031508. Pages copy-on-write: 2274338. Pages zero filled: 33360804. Pages reactivated: 264378. Pageins: 1197683. Pageouts: 43756. Object cache: 20 hits of 1550639 lookups (0% hit rate)

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  • Themes wont work when using Server Side Tags on an ASP.NET Page

    - by Sumit Sharma
    The code for the asp.net page is: <div class="facebox_content"> <% if (CurrentUser.Role == "Free") { %> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;width:380px;"> <tr> <td> User Name : </td> <td> Membership Cost : </td> </tr> <tr> <td style="width:190px;"> <asp:TextBox ID="txtUserName" Enabled="false" runat="server" Text="<%= CurrentUser.Name %>"/> </td> <td style="width:190px;"> <asp:TextBox ID="txtCost" Enabled="false" runat="server" Text="2000"/> </td> </tr> <tr> <td> <br /> Cheque / Draft No.: </td> <td> <br /> Bank Drawn On : </td> </tr> <tr> <td style="width:190px;"> <asp:TextBox ID="txtChqNo" runat="server"></asp:TextBox> </td> <td style="width:190px;"> <asp:TextBox ID="txtBankName" runat="server"></asp:TextBox> </td> </tr> <tr> <td> <br /> Date : </td> <td> <br /> City : </td> </tr> <tr> <td style="width:190px;"> <asp:TextBox ID="txtDate" runat="server"></asp:TextBox> </td> <td style="width:190px;"> <asp:TextBox ID="txtCity" runat="server"></asp:TextBox> </td> </tr> </table> <% } else if(CurrentUser.Role == "Pending") { %> <p style="text-align:justify;"> Your Request is pending with our Administrators. Please be patient while your request is processed. Usually it takes 2-4 Days for your request to be processed after the payment has been received. </p> <% } else if(CurrentUser.Role == "Paid") { %> <p style="text-align:justify;"> You are already a Paid Member of Website </p> <% } %> The code for the C# file is: protected void Page_PreInit(object sender, EventArgs e) { this.Theme = CurrentUser.Theme; } protected void Page_Load(object sender, EventArgs e) { txtUserName.Text = CurrentUser.Name; ConfirmButton.Attributes.Add("onclick", "javascript:document.getElementById('" + lblMsg.ClientID + "').style.display='none';"); if (CurrentUser.Role != "Free") ConfirmButton.Visible = false; } The code is giving the following error: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).] System.Web.UI.ControlCollection.Add(Control child) +8678903 System.Web.UI.PageTheme.SetStyleSheet() +478 System.Web.UI.Page.OnInit(EventArgs e) +8699660 System.Web.UI.Control.InitRecursive(Control namingContainer) +333 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378 Please some one help me out..!!

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  • Premature-Optimization and Performance Anxiety

    - by James Michael Hare
    While writing my post analyzing the new .NET 4 ConcurrentDictionary class (here), I fell into one of the classic blunders that I myself always love to warn about.  After analyzing the differences of time between a Dictionary with locking versus the new ConcurrentDictionary class, I noted that the ConcurrentDictionary was faster with read-heavy multi-threaded operations.  Then, I made the classic blunder of thinking that because the original Dictionary with locking was faster for those write-heavy uses, it was the best choice for those types of tasks.  In short, I fell into the premature-optimization anti-pattern. Basically, the premature-optimization anti-pattern is when a developer is coding very early for a perceived (whether rightly-or-wrongly) performance gain and sacrificing good design and maintainability in the process.  At best, the performance gains are usually negligible and at worst, can either negatively impact performance, or can degrade maintainability so much that time to market suffers or the code becomes very fragile due to the complexity. Keep in mind the distinction above.  I'm not talking about valid performance decisions.  There are decisions one should make when designing and writing an application that are valid performance decisions.  Examples of this are knowing the best data structures for a given situation (Dictionary versus List, for example) and choosing performance algorithms (linear search vs. binary search).  But these in my mind are macro optimizations.  The error is not in deciding to use a better data structure or algorithm, the anti-pattern as stated above is when you attempt to over-optimize early on in such a way that it sacrifices maintainability. In my case, I was actually considering trading the safety and maintainability gains of the ConcurrentDictionary (no locking required) for a slight performance gain by using the Dictionary with locking.  This would have been a mistake as I would be trading maintainability (ConcurrentDictionary requires no locking which helps readability) and safety (ConcurrentDictionary is safe for iteration even while being modified and you don't risk the developer locking incorrectly) -- and I fell for it even when I knew to watch out for it.  I think in my case, and it may be true for others as well, a large part of it was due to the time I was trained as a developer.  I began college in in the 90s when C and C++ was king and hardware speed and memory were still relatively priceless commodities and not to be squandered.  In those days, using a long instead of a short could waste precious resources, and as such, we were taught to try to minimize space and favor performance.  This is why in many cases such early code-bases were very hard to maintain.  I don't know how many times I heard back then to avoid too many function calls because of the overhead -- and in fact just last year I heard a new hire in the company where I work declare that she didn't want to refactor a long method because of function call overhead.  Now back then, that may have been a valid concern, but with today's modern hardware even if you're calling a trivial method in an extremely tight loop (which chances are the JIT compiler would optimize anyway) the results of removing method calls to speed up performance are negligible for the great majority of applications.  Now, obviously, there are those coding applications where speed is absolutely king (for example drivers, computer games, operating systems) where such sacrifices may be made.  But I would strongly advice against such optimization because of it's cost.  Many folks that are performing an optimization think it's always a win-win.  That they're simply adding speed to the application, what could possibly be wrong with that?  What they don't realize is the cost of their choice.  For every piece of straight-forward code that you obfuscate with performance enhancements, you risk the introduction of bugs in the long term technical debt of the application.  It will become so fragile over time that maintenance will become a nightmare.  I've seen such applications in places I have worked.  There are times I've seen applications where the designer was so obsessed with performance that they even designed their own memory management system for their application to try to squeeze out every ounce of performance.  Unfortunately, the application stability often suffers as a result and it is very difficult for anyone other than the original designer to maintain. I've even seen this recently where I heard a C++ developer bemoaning that in VS2010 the iterators are about twice as slow as they used to be because Microsoft added range checking (probably as part of the 0x standard implementation).  To me this was almost a joke.  Twice as slow sounds bad, but it almost never as bad as you think -- especially if you're gaining safety.  The only time twice is really that much slower is when once was too slow to begin with.  Think about it.  2 minutes is slow as a response time because 1 minute is slow.  But if an iterator takes 1 microsecond to move one position and a new, safer iterator takes 2 microseconds, this is trivial!  The only way you'd ever really notice this would be in iterating a collection just for the sake of iterating (i.e. no other operations).  To my mind, the added safety makes the extra time worth it. Always favor safety and maintainability when you can.  I know it can be a hard habit to break, especially if you started out your career early or in a language such as C where they are very performance conscious.  But in reality, these type of micro-optimizations only end up hurting you in the long run. Remember the two laws of optimization.  I'm not sure where I first heard these, but they are so true: For beginners: Do not optimize. For experts: Do not optimize yet. This is so true.  If you're a beginner, resist the urge to optimize at all costs.  And if you are an expert, delay that decision.  As long as you have chosen the right data structures and algorithms for your task, your performance will probably be more than sufficient.  Chances are it will be network, database, or disk hits that will be your slow-down, not your code.  As they say, 98% of your code's bottleneck is in 2% of your code so premature-optimization may add maintenance and safety debt that won't have any measurable impact.  Instead, code for maintainability and safety, and then, and only then, when you find a true bottleneck, then you should go back and optimize further.

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