Checking for Valid Numerical Entry on Each KeyPress

' With acknowledgements to hellswraith (amended)
Amended 02/05/05 to clear textbox if non-numeric entry existing prior to first keypress.

VB Code:

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
       
        Dim I As Integer = Convert.ToInt32(e.KeyChar)
        Select Case I
            Case 13
                MessageBox.Show("Enter Key Pressed")
            Case 8        ' Allow Backspace-delete key
                Exit Sub
            Case Else
                If Not IsNumeric(TextBox1.Text) Then
                    TextBox1.Text = ""
                End If
                If Not IsNumeric(TextBox1.Text & e.KeyChar) Then
                    MessageBox.Show("Non Numeric Character entered  - " & e.KeyChar)
                    e.Handled = True
                End If
        End Select
    End Sub