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The code that I have written to cut and paste on a richtextbox control works fine when the menu item is selected, but when I use the shortcut key ctrl+v the text is pasted twice. I don't know what is causing this or have any idea how to disable the double paste.
may be the way in which you have implemented could be causing a recursive call - something like one change invoking another change etc.
If you are handling _Change event of RichTextbox, check in there, something could be triggering another event.
RK
One paste may be coming from the richtextbox which intrinsically supports the clipboard, and the second paste may be from your menu handler.
Put a break point on the menu handler, and test if ctrl+v is hitting your special paste code.