Cannot Place User Control on Form

Question

I\'ve created a C# WinForms application using VS2010. I\'m new to creating user controls so I created a new user control (as part of the same project).

When I rebuil

Answer 1

I finally figured this one out.

The project I'm working with uses two class-library assemblies. Although these have nothing to do with the control I'm discussing, I looked and saw both libraries have Platform Target in the Properties|Build tab set to "Any CPU".

On the other hand, my application had this setting set to "x64". By changing my application's setting to "Any CPU", I can now place my user controls onto my forms.

Go figure...

Answer 2

I had this problem too, but the answer couldn't fit for me. My project has some issues it can only target x86 and x64 separately. In other words, I can't use AnyCPU configuration (that's because I reference different libraries for each configuration, since those libraries are not fit to AnyCPU).

The solution I came up with was: when I need to use the form designer, I change the setting to x86. Do the job, then set back to x64 and test. The problem occurs only with the designer, but the solution builds and runs fine.