now I have learned how to assign values for textnum1 and textnum2, and where to put my first and second number. And also I realize that I have problem
1. on my command1 procedure, now it is solve thanks to you and
2. on cmdPlus, I am concentrating on this procedure yet I am not assigning the values right.

now this is the main problem
1. Click the "1" button twice. "11" will be the first number will appear in the TextDisplay box.
2. Click the "+" button once. (give command for the operation ).
3. Click the "1" button again. (will be the second number also appear on the TextDisplay).
4. Click the "+" button again. (display the sum of the first two number then give the command for the next operation).
5. Click the "1" button. Repeating the process

if #1 and #2 is already added it will become the first number and next number to be added will be the second number.

Sir we're close, if you could solve cmdPlus procedure maybe I can do the rest cmdMinus, cmdMultiply amd cmdDevide. And I can complete the number from 0-9.:)

Apparently solved.