[RESOLVED] Where to create code to limit form opening by password Visual Studio 2012

[oldGMtireman]

I have an Visual Studio 2012 application that has 3 forms:

Form 1 is the main form
Form 2 is a settings form
Form 3 is a password form

I want the user to enter a password in Form 3 to open Form 1 if a password exists , otherwise just open Form 1
I also want the user to be able to change the password (using the same Form 3) from the settings Form 2

I haven't written any code for this - I KNOW HOW TO DO WHAT I WANT! I just need help locating where to put the
code to prohibit Form 1 from opening unless the correct password is entered (if any).

Thank you