I have created a form in Visual Studio 2013 which is used to enter data in Excel by multiple users at same time. It works perfectly fine except if two users open form at the same time or if one has clicked submit and the form is still processing, error occurs.

Unhandled exception has occurred in your application. Exception from HRESULT: 0x800A03EC
When writing data to file, I want to make it read only so that other users can wait. How do I do this?

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