title: Problems Using (AjaxControlToolkit)ASP.NET AJAX Control Toolkit and Telerik RadControls for ASP.NET AJAX
body: <p>I am using (AjaxControlToolkit)ASP.NET AJAX Control Toolkit which is an open-source project built on top of the Microsoft ASP.NET AJAX framework.</p>
  
  <p>Also, I am using the Telerik RadControls for ASP.NET AJAX</p>
  
  <p>In order to use the (AjaxControlToolkit)ASP.NET AJAX Control Toolkit, I have to declare the asp:ScriptManager  in my aspx page.</p>
  
  <p>In order to use the Telerik RadControls for ASP.NET AJAX, I have to declare the telerik:RadScriptManager in my aspx page.</p>
  
  <p>Sadly, I get the following error:</p>
  
  <p>Only one instance of a ScriptManager can be added to the page.
  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.</p>
  
  <p>Exception Details: System.InvalidOperationException: Only one instance of a ScriptManager can be added to the page.</p>
  
  <p>Source Error:</p>
  
  <p>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.</p>
  
  <p>Could someone please tell me how I can use both technologies?</p>
  
  <p>Thanks,</p>
  
  <p>New</p>