Hi --
I'm not entirely positive what you mean by your question, but if you are asking how to set your form to use C#, you can follow these steps:
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Under the Tools menu, select Form Options
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Select Programming
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If there is already a project attached to the form that is not in the language you want, select Remove Code (if it is script, be sure to make a copy of anything you might wish to save)
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Select C#
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Make sure you have your desired project location for your code
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Select OK
If I misunderstood your question, could you clarify it further for me?