怎么用vb编写一个加减法运算

以下是一个用VB编写的简单加减法运算的示例代码：Public Class Form1Private Sub btnCalculate_Click(sender As Object, e As EventArgs) Handles btnCalculate.ClickDim num1, num2, result As Integernum1 = CInt(txtNum1.Text)num2 = C