菜鸟提问：5除以2取整数得2？

Question

看MSDN Library教程写的程序，代码如下

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim a As Integer = TextBox1.Text
        Dim b As Integer = TextBox2.Text
        Dim c As Integer = a / b
        MsgBox(c)
    End Sub
End Class

 

TextBox1输入5，TextBox2输入2，得到答案是2.但是TextBox1输入7，TextBox2输入2，得到答案是4.又输入TextBox1输入9，TextBox2输入2，得到答案也是4。这是怎么回事？望高手解答，，，多谢。。。