Design Time Error with Controls

4 posts, 1 answers
  1. StevenDale
    StevenDale avatar
    100 posts
    Member since:
    Apr 2007

    Posted 25 Jun 2009 Link to this post

    I am getting the following error message when I am in design mode in Visual Studio 2008:

    System.IO.FileNotFoundException: Could not load file or assembly 'Telerik.Web.UI, Version = 2009.1.402.35, Culture=neutrual,PublicKeyToken=121fae78165ba3d4' or one of its dependencies.  The system cannot find the file specified.  File name: 'Telerik.Web.UI, Version=2009.1.402.35,Culture=neutral,PublicKeyToken=121fae78165ba3d4' at Telerik.Web.Design.RadGridDesigner.GetDesignTimeHtml(DesignerRegionCollection regions) at System.Web.UI.Design.ControlDesigner.GetDesignTimeHtml(DesignerRegionCollection regions) at System.Web.UI.Design.ControlDesigner.GetViewRendering(ControlDesigner designer)

    This is running on a 64 bit Windows Vista. This is a new installation of asp.net ajax.

    Thanks,

    Billy Jacobs
  2. Shinu
    Shinu avatar
    17764 posts
    Member since:
    Mar 2007

    Posted 26 Jun 2009 Link to this post

    Hi Billy,

    Please make sure that the Telerik.Web.UI.dll file is present in your project's bin folder. Checkout the following forum link which discusses similar scenario. Hope this helps.
    Problem with installation
    Error Creating Control

    You can also refer following links for more information.
    General Troubleshooting

    Thanks,
    Shinu
  3. UI for ASP.NET Ajax is Ready for VS 2017
  4. StevenDale
    StevenDale avatar
    100 posts
    Member since:
    Apr 2007

    Posted 26 Jun 2009 Link to this post

    The Telerik.Web.UI.dll is in the bin folder and is the correct version 2009.1.402.35.

    In the GAC I had 2 Telerik.Web.Design assemblies with different versions. I deleted the 2009.1.402.20 version. This did not resolve my problem either.

    My web.config file has the following references to Telerik:

    <

     

    add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false" />

     

    <

     

    add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" />

    The only controls that I am using are the RadMenu and the RadGridView.

    Thanks,

    Billy Jacobs

     

  5. Answer
    Pavlina
    Admin
    Pavlina avatar
    6084 posts

    Posted 26 Jun 2009 Link to this post

    Hi Billy,

    Do you have a reference to the Telerik.Web.Design assembly in your project? Review the following blog post (referenced in the discussion below) which elaborates on this subject for more details about how to address design-time errors with the Q1 2009 release of RadControls for ASP.NET AJAX.

    Kind regards,
    Pavlina
    the Telerik team

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