I have four textboxes in my calculator. Textbox 1, Textbox 2, Textbox 3 (acts for the Operand) and Textbox 4 (the result).
I have a button called Result and when clicked, I want the result to show in the 'Textbox 4'. How would I go about that.
Also, when entered an alphabetic character into any of the boxes, it should be able to prompt a message saying ' it is an invalid character' and when entered numbers in the Textbox 3 (Operand), it should also prompt a message saying it is 'invalid'
Can anyone help?