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I have a string array Thank you. I have a string array written that contains the letters... A,B,C and so on. More specifically how would I use an indexof to check for these letters entered?

I would like to check the user input into an inputbox in vb.net 2003. The inputbox in my program assigns the input from the inputbox into an array called get_grades which takes in students grades as in.. A.. B.. C...D...F. My question is how could I check the user input to make sure its within...