21. Consider the following code snippet very well and answer the following questions.[8 marks]

Dim result as integer

Dim firstinput as integer

Dim secondinput as integer

Dim thirdinput as integer

firstinput = txtfirstinput.text

secondinput = txtsecondinput.text

thirdinput = txtthirdinput.text

a. Write the code for displaying the result after adding the contents of the first two textboxes.

b. Write the code for displaying the result after calculating average of the contents of the three textboxes.