When we use the AJAX Control Toolkit ModalPopupExtender, sometimes we may get below error Sys.Extended is undefined$create(Sys.Extended.UI.ModalPopupBehavior, {"BackgroundCssClass":... After few hours of investigation, I realized that keyword I’m using it for scriptmanager.If you are using .net 4.0 framework, then change it from <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></asp:ToolkitScriptManager> To <asp:scriptmanager  ID="ToolkitScriptMa... [More]

Some time back, I was struggling to include the custom control to a page which I have created under the app_code folder to aspx page. Manually, I have done this with tags and so on. But I couldn't register it to the page. I felt I stuck here and there is no option to do that so. But I have noticed that many places of sample application, They referred the simple custom control in their pages. Below is that simple option to refer the custom controls to your asp.net pages.1.    ... [More]