If you want to use a value entered into a textbox in a numeric calculation where numbers are divided, you must first

1. assign it to a string variable

2. convert it to String such as decTotal.tostring(C2)

3. convert it to an decimal using convert.todecimal(textbox1.text)

4. Assign the value to the output such as txtOutput.text = decTotal

An IF-THEN-ELSE-END IF was primarily used to

1. control program flow by testing if the calculations are accurate

2. add text to the txtoutput.text

3. control program flow by checking that user entry was valid

4. create global variables