如何在VB中使用keypress？

　　代码如下：
　　Visual Basic code
　　Private Sub GcTextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles GcTextBox2.KeyPress
　　'单独判断回车
　　Dim a As Char = Convert.ToChar(Keys.Enter)
　　If e.KeyChar.Equals(a) Then
　　MessageBox.Show("Enter Press")
　　End If
　　'判断CTRL+回车
　　If (Control.ModifierKeys And Keys.Shift) = Keys.Shift Then
　　Dim aa As Char = Convert.ToChar(Keys.Return)
　　If e.KeyChar = aa Then
　　MessageBox.Show("Control+Enter Press")
　　End If
　　End If
　　End Sub