Can someone help my calculations are off

C#

void btnAverage_Click(object sender, EventArgs e) []=(grades[,]+grades[0,1]+grades[,2]+grades[,3]+grades[,4])/5;[1]=(grades[1,0]+grades[1,1]+grades[1,2]+grades[1,3]+grades[1,4])/5;[2]=(grades[2,0]+grades[2,1]+grades[2,2]+grades[2,3]+grades[2,4])/5;[3]=(grades[3,]+grades[3,1]+grades[3,2]+grades[3,3]+grades[3,4])/5;[4]=(grades[4,0]+grades[4,1]+grades[4,2]+grades[4,3]+grades[4,4])/5; Text = Convert. Tostring (grade[]); Text = Convert. ToString ( grade [1]); Text = Convert. Tostring (grade[2]; Text = Convext. Tostring (grade[3]); Text = Convert Tostring (grade[4]); 1.Text = Convert tostring (avg [0]); 2. Text = Convert tostuing (avg[1]); 3. Text = Convert. Tostring ( avg (2]); 1.Text = Conveet, Tostwing (avg [3]) 5. Text = Convert. Tostwing (avg[4]); No issues found the five student names, an array of five strings to hold each student's letter grades, and five arrays of four single precision numbers to hold each student's set of test scores. Equip the application with a set of buttons that allows the application to perform the following: - Display a form that allows the user to enter or change the student names and their test scores. - Calculate and display each student's average test score and a letter grade based on the average. Input validation: Do not accept test scores less than zero or greater than 100. 1. This is the main form. When a user clicks the Edit Student Data button, the bel 3. Ent Ch: Close the Edit Student Data form and click