When VS2013 was tied to TFS (I am not sure of the version, perhaps 2010 was in the previous report) and the Environment was selected, VS would not update the designed files.
That was not just related to our controls, it happened with all standard controls too.
Throw Exception For HRInternal(Int32 error Code, Int Ptr error Info) at Microsoft.
Regards, Marin Bratanov Telerik Sorry to bring up an old post, but I have the exact issue described here (plus a slightly different one). NET application that hosts several sub applications (they all reside in the same folder, the projects only include the relevant files for each application).To regenerate the .file for a ASPX/ASCX, first delete the .file, then right click on the ASPX/ASCX and click “Convert to Web Application”.This will probably give you an error message that will help you find the root of the problem.If you are lucky you know exactly what you changed in the page to cause this problem and you fix it.However, if you’re opening a file that hasn’t been worked on in a long time (maybe someone else did the most recent modification), it becomes difficult to know what exactly cause the .automatic generation fail.