c# - The designer could not be shown for this file because none of the classes within it can be designed -

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yes searched , solution on post didnt work, scenario different.

i have winform application, simple, working, , error on title of post shown when try open form.
thing have done installed vs11 developer preview , vs 2010 sp1.

any idea how fix this?>

i managed solve it, checked on properties of project , framework selected .net 4.0 client profile.

i changed .net 4.0 , worked.

by way mean client profile, for??


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