Visual Studio 2010 Designer Error on Run

Question

I am using using VS2010 and if I have a form open in designer mode and run my application the designer tab will no longer show the form designer but instead an error will be di

Answer 1

This error occur if the Form class is not a first class in the file, for example if there is some helper class at the beginning of the file.

To solve this issue, move all other classes except Form class to the bottom of the file.

Answer 2

I had the same problem using A control With Generics

      MvpUserControl<Presenter,IViewMode> : UserControl

what I do it's Remove the Reference and Add again, Clean and Rebuild the Solution I Hope this can be useful for anybody else

Answer 3

I ran into this today after upgrading VS2019. I went to properties, configuration tab, and set the projects to Configuration = Debug, Platform = Any CPU. Then it worked.

Answer 4

I tried clean solution and re-build solution and worked for me. Hope this help!

Answer 5

I had the same problem with VS2010 SP1. Finally using Windows Update I saw some updates for Visual Studio and .Net, I installed them and is not happening any more.

Answer 6

"In the project file (.vcxproj), locate the entry for the target Framework version. For example, if your project is designed to use the .NET Framework 4.5, locate v4.5 in the element of the element. "

(Microsoft)

In my case the "v4.5" didn't exist so I add it, and everything is good now.