Add Value From Textbox1 And Textbox2 - Display In Textbox3?

I have a simple program with 3 textbuttons. It takes the value from text box1 and text box 2, and it should add the 2 numbers and display it in textb ox3. How can I add the value from text box1 and text box2 and display it in text box3 ?

VB:
Private Sub TextBox3_Change()
TextBox3.Value = CInt(TextBox1.Value) + CInt(TextBox2.Value)

[Code]....

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