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Visual basic 2010 Express Verify User Login Details? Help!

This is for a login form. The user needs to enter the correct username and password which are stored on the text file to gain access.

I already have the usernames and passwords in the text file so i need to know how to compare them with what the user entered

How do I check to see what the user has entered in the username and password text box with what the username and password is saved as on a text file?

For example,

IN THE TEXT FILE:
exampleusername, examplepassword
username2, password2

i need to compare what the user entered for the username and password with the correct login details already saved in the text file.

If the user enters the wrong password/username for that username/password there will be a message box saying error.

If the user enters the correct information form the text file they shall be allowed access

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