login feature in VB.Net

I am trying to create or find a way to develop a login feature for a program I am writing in VB.Net. The function would have the same capabilities as when a user signs onto users (username and password). How would I develop this function and what is the code for the function?

For example, a window/form will pop-up each time the program is ran and states:

Username: __________
Password: __________

It will verify the username with its correct password stored in a textbox or somesort. After this function is validated, the rest of the program is open to access to the user. This feature/function will act as a security device, just as how a user wants to secure certain items under a specific username under a windows login.

Be more specific with the part you need help on. What do you have so far? What do you need help with?

Why don't you just use Windows Authentication as your means of authenticating users? Maintaining a seperate login is a pain when it has already been implemented in Windows. You can then set up roles for your app, and place the people that are allowed to do the things in those roles.

Is the way you want to do it a requirement for the app?