a. when user press ,the program calculates the summation of the four grades (Grade1+Grade2+Grade3+Grade4) and print the result in the picture box (picSum)

b. when the user press , the program calculates the average of the four grades by calculating the summation firstly, and then divide the summation by 4

(Grade1+Grade2+Grade3+Grade4)/4

Finally, the results have to be printed in the picture box (picAvg)

c. if the user forget to enter a value of one or more grade , or if the user entered a non-numaric value like “a”, the program must consider these unexpected values as zeros

for example: if the user enter the values

Grade1=8

Grade2=9

Grad3= “” (nothing: forget to enter a value)

Grade4=”Ab”

The summation must be 8+9+0 (instead of “”) + 0 (Instead of “AB”) =17

4. if the user press button , the program must erase any value in the four Text Boxes ( txtGrade1 , txtGrade2, txtGrade3, txtGrade4), and the two picture boxes: picSum, and picAvg

b. when the user press , the program calculates the average of the four grades by calculating the summation firstly, and then divide the summation by 4

(Grade1+Grade2+Grade3+Grade4)/4

Finally, the results have to be printed in the picture box (picAvg)

c. if the user forget to enter a value of one or more grade , or if the user entered a non-numaric value like “a”, the program must consider these unexpected values as zeros

for example: if the user enter the values

Grade1=8

Grade2=9

Grad3= “” (nothing: forget to enter a value)

Grade4=”Ab”

The summation must be 8+9+0 (instead of “”) + 0 (Instead of “AB”) =17

4. if the user press button , the program must erase any value in the four Text Boxes ( txtGrade1 , txtGrade2, txtGrade3, txtGrade4), and the two picture boxes: picSum, and picAvg

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