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Can you show us the actual code where you create the form and display it?<br />
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Also, why are you hiding FormB?
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Can you show us the actual code where you create the form and display it?

Also, why are you hiding FormB?

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I open &nbsp;FormB from FormA using FormB.ShowDialog(FormA).<br />
When I hide FormB the display blink and showing the desktop for several miliseconds.<br />
When I use Show() instead of ShowDialog() it works OK.<br />
I got an error trying to set FormB.Parent=FormA, and Setting FormB.Owner=FormA did not help.<br />
How can I solve this?
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I open  FormB from FormA using FormB.ShowDialog(FormA).
When I hide FormB the display blink and showing the desktop for several miliseconds.
When I use Show() instead of ShowDialog() it works OK.
I got an error trying to set FormB.Parent=FormA, and Setting FormB.Owner=FormA did not help.
How can I solve this?

Blinking display when hiding form

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).