Visual Basic

I got a question about Visual Studio , Which are the codes to make a button do certain action like rest a number to a textbox when you clic -left button- , Is it possible ?. I don´t find how to do it .

[code]RestNumberInTextBoxOnMouseLeftClick(1, 664, TextBoxProperties.InterpretAsInteger, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 12.5, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, ArithmeticOperations.Substraction);