VB How to read a line from a text file and declare it as a variable?

I have a log in screen and need to be able to read from a a text file and declare the word in the text file as a variable.

So basically ' if txtpassword.text = (The word from text file) then ... login ect..VB How to read a line from a text file and declare it as a variable?
are you sure you want the password to be coming from a text file? The text file has it in plain text.. are you really sure?