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Asked: 2026-06-02T00:30:39+00:00

I have a simple System.Windows.Forms.Form . Based on business requirements, once certain functionality becomes

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I have a simple System.Windows.Forms.Form.
Based on business requirements, once certain functionality becomes available as a result of some background processing, I am increasing the form’s size and opening up a previously hidden area with additional controls (buttons etc). The changes to the form’s size are done by a background thread, using BeginInvoke.

All this works fine. However, if the user is dragging around the form on the screen, and coincidentally during this time the method that changes form’s size is called, the size change does not become effective (technically, the form changes size, but instantaneously reverts to the previous size).

I am changing the form size by setting the Form.Size property, but have tried other ways like setting Form.ClientSize, and calling Form.SetBounds(). Have also tried out Form.SuspendLayout()/Form.ResumeLayout() and forcing Form.PerformLayout().

Nothing I have tried so far works, and when it is being moved around, the form refuses to change size.

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1 Answer

  1. Editorial Team

    Put code in the Form_LocationChanged event to detect if the previously hidden area is visible (or should be via a bool variable) and resize the form accordingly. Otherwise the ResizeEnd event fires after a move ends, try that.

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