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.