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How to Resolve CS0234 Error in Telerik.QuickStart Namespace


Product Version
Telerik UI for ASP.NET AJAX all


I am encountering the "CS0234: The type or namespace name 'QuickStart' does not exist in the namespace 'Telerik' (are you missing an assembly reference?)" error when using the Telerik.QuickStart namespace. I have tried to find the QuickStart files or DLL in my Telerik package but have been unsuccessful.


The Telerik.QuickStart namespace is part of the demo website and is used only for the purposes of the demos.

To resolve this error, follow these steps:

  1. Download the Telerik UI for ASP.NET AJAX 20xx_x_xxx_Demos_Dev.msi from your Telerik account by going to
  2. Install the downloaded Telerik UI for ASP.NET AJAX demos.
  3. Open the App_Code folder in the installed demo site.
  4. Copy the QuickStart files from the App_Code folder to your project's App_Code folder.
  5. Make sure that the Build Action of all QuickStart-related files is set to "Compile".

Alternatively, the Isolate this demo as a stand-alone application page shows how to remove it from the demos. This page is available as a link on each demo along with a download option with ready-to-use demo files (Download demo code files):


  • The QuickStart namespace is only used in the Telerik AJAX demo website and is not required to use your project's Telerik controls.
  • The QuickStart files provided in the demos are written in C#. If you are using a Visual Basic project, you may need to convert the code to Visual Basic yourself.

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