Need to use:

Windows Forms App (NET Framework) Visual C# Exercises Exercise 5-1 Create a form named Grade With Method_ 1 that lets you to do the following: Enter a score (0-100) into a TextBox named txtScore, and compute the letter grade by clicking a button. Use the scale 90, 80, 70 for A, B and C, respectively. The letter grade must be computed using a som method named ComputeGrade, which displays the letter grade using a MessageBox. Clal tis nali from the Click event of the button passing the score as a parameter to the method