VB was easy

Our graded exercise consisted of inputting a value (x) and a character and then generating x rows of characters which are x characters wide. I think there were people who were having difficulties with it. I also did about 90% of our homework for next week. All it does is input a minimum value and a maximum value and display all the prime numbers between the two. I just need to make my code a little more readable, make some alterations to the GUI, and code in some error messages.

Edit: Am I the only one who sees the humor in a video game where you shoot your enemies with STDs?