You will probably observe the same behaviour in case of other applications too (not Forms only).
Some authors recommend using RichTextBox control (in single-line, plain-text mode). Check if you can reproduce the issue in this case.
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Why in VStudio on the running Windows Form(C#) when repeated mouse selection text from a TextBox - it flickers (as if it is being drawn again)?
Can this be fixed?
Double buffering doesn't help.
You will probably observe the same behaviour in case of other applications too (not Forms only).
Some authors recommend using RichTextBox control (in single-line, plain-text mode). Check if you can reproduce the issue in this case.