How do I lock down a windows programs with Usernames and passwords?

I am developing a program that uses a view to display information. Usernames and other valuable information.

How do I set it so that at the first run of the program brings it to a different form to input a new password? The user has never logged in before. Then the second run of the program prompt for that password.

Ideally the solution will be done in C开发者_Go百科# and using Winforms.

However an algorithm is acceptable.

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The program has been aborted. Please close this thread

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look at forms authentication in c#. lots a controlsbuilt in to .net to help you.