What I need is a text box control that only allows users to paste into (either by using the mouse to right click and paste, or by using Ctrl + V). I also need the user to be able to use the backspace button. I have the following code, but I'm having difficulty trying to figure out how to allow the Ctrl + V functionality, as well as the backspace. It DOES currently allow me to only paste, but only by using the mouse. Could anyone offer some assistance?

Code:
 Private Sub TextBox1_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
        If e.Control AndAlso e.KeyCode = Keys.V Then
            Dim testVal As Integer
            If Integer.TryParse(Clipboard.GetText, testVal) Then
                TextBox1.Text = testVal.ToString

            End If
        End If
        e.Handled = True
        e.SuppressKeyPress = True
    End Sub

    Private Sub TextBox1_TextChanged(sender As Object, e As System.EventArgs) Handles TextBox1.TextChanged
        Dim testVal As Integer
        If Not Integer.TryParse(TextBox1.Text, testVal) Then
            TextBox1.Text = ""

        End If
    End Sub