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  • Common reasons for the &lsquo;Sys is undefined&rsquo; error in ASP.NET Ajax applications

      In this blog I will try to summarize the most common reasons for getting the famous 'Sys is undefined' error when running an Ajax enabled web site or application (there are almost one milion results on Google for that phrase). Where does it come from? In every Ajax web pages source you will see a code like this: <script type="text/javascript"> //<![CDATA[ Sys.WebForms.PageRequestManager._initialize('ScriptManager1', document.getElementById('form1')); Sys.WebForms.PageRequestManager.getInstance()._updateControls([], [], [], 90); //]]> </script>   This is the initialization script of the ScriptManager. So, if for some reason the Sys namespace is not available when the code executes you get the Sys is undefined error. Here are the most common reasons and solutions for that problem:   1. The error occurs when you have added a control from RadControls for ASP.NET AJAX, but your application is not configured to use ASP.NET AJAX. For example, in VS 2005 you created a new Blank Site instead of a new Ajax-Enabled Web Site and the Sys is undefined message pops up. To fix it you need to follow the steps described at Configuring ASP.NET Ajax article (check the topic called Adding ASP.NET AJAX Configuration Elements to an Existing Web Site) or simply create the Ajax-Enabled Web Site. You can also check my other blog post on the matter: Visual Studio 2008: Where is the new ASP.NET Ajax-Enabled Web Site template?   2. Authentication - as the website denies access to all pages to unauthorized users, access to the Telerik.Web.UI.WebResource.axd handler is unauthorized (this is the default handler of RadScriptManager). This causes the handler to serve the content of the login page instead of the combined scripts, hence the error. To solve it - add a <location> section to the application configuration file to allow access to Telerik.Web.UI.WebResource.axd to all users, like: <configuration> ... <location path="Telerik.Web.UI.WebResource.axd"> <system.web> <authorization> <allow users="*"/> </authorization> </system.web> </location> ... </configuration>   Note that the access to the standard ScriptResource.axd and WebResource.axd is automatically allowed for all users (authenticated and unauthenticated), so if you use the ScriptManager instead of RadScriptManager - you will not face this problem. The authentication problem does not manifest when you disable script combining or use the CDN. Adding the above configuration section will make it work with RadScriptManagers combined script.   3. The IE6 browser fails to load the compressed script. The problem does not appear in any other browser. There is a well known bug in the older versions of IE6 which lose the first 2,048 bytes of data that are sent back from a Web server that uses HTTP compression. Latest versions of RadScriptManager does not compress the output at all if the client is IE6, but in the previous versions you need to manually disable the output compression to prevent the error. So, if you get the Sys is undefined error in IE6 - update to the latest version of RadControls or simply disable the output compression.   4. Requests to the *.axd files returns Error Code 404 - Not Found. This could  be fixed easily: Check in the IIS management console that the .axd extension (the default HTTP handler extension) is allowed:     Also check if the Verify if file exists checkbox is unchecked (click on the Edit button appearing in the previous screenshot to check). More information can be found in our troubleshooting article and from the ASP.NET QA team blog post   5. The virtual directory in IIS is not marked as Web Application. Converting it to Web Application should fix the problem.   6. Check for the <xhtmlConformance mode="Legacy"/> option in your web.config and remove it. It would be rather rare to become a victim of this exact case, but still have it in mind. Scott Guthrie describes it in more details   In the above points I mentioned several times the terms web resources, javascript output, compressed script. If you want to find out more about these please see the Web Resources Demystified series of my friend and colleague Atanas Korchev   I hope that one of the above solutions will help you get rid of the Sys is undefined error.   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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  • Custom .NET apps and clustering

    - by Ahmed ilyas
    So for a clustered environment - how would this work with your apps? what about your own custom .NET apps? Would there be a special way to develop them? I know that you can say create a simple Hello world app, and cluster that but they wouldnt be something you could see interms of the UI or anything, so they would effectively need to be developed as a Windows Service perhaps or even as a standard Console app which runs and not wait for user input but you wouldnt see any output from it (unless you redirect output to somewhere else) What im getting at here is... for those who have experience or developed a cluster application in .NET, how did you do it and what are the things to be aware of? For example we have the cloud service - fundamentally its built on clustering - if there is an outage, another node takes place and service is resumed as normal but we dont really see much of that downtime.

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  • Google I/O 2010 - Casting a wide net for all Android devices

    Google I/O 2010 - Casting a wide net for all Android devices Google I/O 2010 - Casting a wide net: How to target all Android devices Android 201 Justin Mattson One of Android's strengths is its flexibility to run on a wide variety of devices. In this session, we will explore the facilities the Android resource system provides to developers to make supporting many devices from one application binary easier, as well as common pitfalls. In addition to hardware heterogeneity, more than one version of Android may exist in the wild at any given time. We will go over strategies for providing cross-version compatibility. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 4 0 ratings Time: 01:02:15 More in Science & Technology

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  • A .NET developers introduction to SharePoint

    - by Sahil Malik
    SharePoint 2010 Training: more information Are you a .NET developer sitting on the edge, looking at the vast space that is SharePoint? Ever wondered what is a typical SharePoint project like? No, not the marketing fluff, but what it is really like, and what does it make to make it work properly. What is all this cloud stuff all about, and how does it affect you?   On February 5th, 2013, I will have a session from 14:00 – 15:00 at DevWeek (www.devweek.com) in London about “A .NET developer’s introduction to SharePoint”.   You can find the full conference agenda here, http://www.devweek.com/sessions/conference1.asp Read full article ....

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  • C#.NET: How to update multiple .NET pages when a particular event occurs in one .Net page? In another words how to use Observer pattern(Publish and subscribe to events)

    Problem: Suppose you have a scenario in which you have to update multiple pages when an event occurs in main page. For example imagine you have a main page where you are dispalying a tab control. This tab control has 3 tab pages where you are loading 3 different user controls. On click of an update button in main page imagine if you have do something in all the 3 tab panels. In other words an event in main page has to be handled in many other pages. An event in main page which contains the tab control has to be handled in all the tab panels(user controls) Answer: Use Observer pattern Define a base page for the page that contains the tab control. Main page which contains the tab: Baseline_Baseline Basepage for the above main page: BaselineBasePage User control that has to be udpated for an event in main page: Baseline_PriorNonDeloitte Source Code: public class BaselineBasePage : System.Web.UI.Page { IList lstControls = new List(); public void Add(IObserver userControl) { lstControls.Add(userControl); } public void Remove(IObserver userControl) { lstControls.Remove(userControl); } public void RemoveAllUserControls() { lstControls.Clear(); } public void Update(SaveEventArgs e) { foreach (IObserver LobjControl in lstControls) { LobjControl.Save(e); } } } public interface IObserver { void Update(SaveEventArgs e); } public partial class Baseline_Baseline : BaselineBasePage { . . . this.Add(_ucPI); this.Add(_ucPI1); protected void abActionBar_saveClicked(object sender, EventArgs e) { SaveEventArgs se = new SaveEventArgs(); se.TabType = (BaselineTabType)tcBaseline.ActiveTabIndex; this.Update(se); } } Public class Baseline_PriorNonDeloitte : System.Web.UI.UserControl,IObserver { public void Update(SaveEventArgs e) { } } More info at: http://www.dofactory.com/Patterns/PatternObserver.aspx span.fullpost {display:none;}

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  • Employee Info Starter Kit (v4.0.0) - Visual Studio 2010 and .NET 4.0 Version is Available Now

    Employee Info Starter Kit is a ASP.NET based web application, which includes very simple user requirements, where we can create, read, update and delete (crud) the employee info of a company. Based on just a database table, it explores and solves most of the major problems in web development architectural space.  This open source starter kit extensively uses major features available in latest Visual Studio, ASP.NET and Sql Server to make robust, scalable, secured and maintainable web applications...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 make safe and secure forms in asp.net MVC 3

    - by anirudha
    the asp.net application need all kind of security. unsecure forms may be influence by XSS [cross site scripting] there is some way to solve these type of problem in MVC. first sollution is that use <%= Html.AntiForgeryToken() %> for make secure from cross site scripting. it’s work by machine key in MVC. well you can valid them whenever you got respond from client. you can apply by this attribute on action you give the response behalf of form submission [ValidateAntiForgeryToken] you can secondly use authorize attribute where you can make own definition of authorize attribute in asp.net mvc for more info read david’s post well I am use my own custom attribute who use a different type of authorization :- the who controller use a attribute I put their and the attribute I put their have a logic and logic check the cookie in request who make sure that request they got from user.

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  • Coding an IQ Test with Conditionally Driven Event Handlers in ASP.NET 3.5

    This is the second part of a tutorial series on developing conditionally-driven event handlers in ASP.NET 3.5. In part one you started learning how to build an online IQ test with ASP.NET 3.5 the creation of web forms and setting of objectives were discussed. In this second part we ll really sink our teeth into using conditionally-driven event handlers to make the test work.... Business Productivity Online Suite From $10 per user per month. Includes a 12-month subscription. Min 5 seats.

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  • cruisecontrol.net failing build with no errors

    - by John Hoge
    Hi, I've been using CCNet for some time now but just upgraded to .net 4. I've installed the new framework on my dev box along with vs2010 and on my CC.net server as well. I've just installed CruiseControl.net version 1.5.6804.1, and changed my MSBuild tasks to point to the new v4.0.30319 framework directory. I've got two projects on .net 4 now that just don't build. They build perfectly well in VS and run well on both Cassini and IIS. I just don't get any error messages from cc.net, just this: BUILD FAILED Project: GoodBay Date of build: 2010-05-11 10:21:59 Running time: 00:00:02 Integration Request: Build (ForceBuild) triggered from SVN Modifications since last build (0)

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  • How to convert List to Datatable in vb.net

    - by Samir R. Bhogayta
    Public Function ConvertToDataTable(Of T)(ByVal list As IList(Of T)) As DataTable        Dim table As New DataTable()        Dim fields() As FieldInfo = GetType(T).GetFields()        For Each field As FieldInfo In fields            table.Columns.Add(field.Name, field.FieldType)        Next        For Each item As T In list            Dim row As DataRow = table.NewRow()            For Each field As FieldInfo In fields                row(field.Name) = field.GetValue(item)            Next            table.Rows.Add(row)        Next        Return table    End Function

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