Winforms issue – Error creating window handle [duplicate]

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Have you run Process Explorer or the Windows Task Manager to look at the GDI Objects, Handles, Threads and USER objects? If not, select those columns to be viewed (Task Manager choose View->Select Columns… Then run your app and take a look at those columns for that app and see if one of those is growing really large.

It might be that you’ve got UI components that you think are cleaned up but haven’t been Disposed.

Here’s a link about this that might be helpful.

Good Luck!

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