form designer for host.cs is not bring displayed


Your code works perfectly. But, when I try to view the form designer for the Host.cs, it displays an error msg like:
"The designer could not be shown for this file because none of the classes within it can be designed. The designer inspected the following classes in the file: Class1 --- The base class 'WindowsApplication1.Form1' could not be loaded. Ensure the assembly has been referenced and that all projects have been built."
The build succeeds and everything works, but I'm not able to view the designer. There was a workaround on the Ms knowledge base to change the build target to 'Any Cpu'. I have tried it..doesnt work
could you suggest a solution?