Ok, I want to help. But I have to say that MoepMeep is right, also I wouldn't express it like that. The solution to this problem are return values and if-questions, which are explained in the first chapters.
Code:
public bool Check1() // returns true on success, false otherwise
{
//your code (you know how to return a value?)
}
All Check-Functions are like that and in Form Load:
Code:
if (Check1() == false)
{
Application.exit();
}
if (Check2() == false)
{
Application.exit();
}
if (Check3() == false)
{
Application.exit();
}
// I think that's not the best way, but it should work
I would highly recommend to buy a book and learn something from there. If you have a real problem that is not explained in the first chapters of a standart programming book, you can ask it here. I think that is what MoepMeep wanted to say that

I hope that I helped

Jeoni
P.S.: Next time put your code in the Code-Tags please.