Login Problem in C#

Question

hello friends,
i have  very little bit Problem actually i just want to give only 3 a temps to user for login purpose... after that login form should be close... i have already right to code for user_id and Password but i don't have any idea how can i give 3 a temps to user for login.. if you have any idea or do u have any code then please let me know....

Thanks in Advance