Hi @VKSB ,
Verify that the keyboard shortcuts (Ctrl+C for Copy, Ctrl+X for Cut, Ctrl+V for Paste) are not overridden or disabled elsewhere in your application. Sometimes, other controls or forms might have these shortcuts bound to different actions.
Try using Clipboard.SetText Method to copy the text from the richtextbox to the clipboard.
Best Regards.
Jiachen Li
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