how to validate a text box to accept only alphabets and numbers. no special characters. in vb.net

i have tried the following code but it doesn't allow numbers but it allows alphabets only

Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
        If (Microsoft.VisualBasic.Asc(e.KeyChar) < 65) _
            Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 90) _
            And (Microsoft.VisualBasic.Asc(e.KeyChar) < 97) _
            Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 122) Then
            'Allowed space
            If (Microsoft.VisualBasic.Asc(e.KeyChar) <> 32) Then
                e.Handled = True
            End If
        End If
        ' Allowed backspace
        If (Microsoft.VisualBasic.Asc(e.KeyChar) = 8) Then
            e.Handled = False
        End If
End Sub
Private Sub TextBox1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If Char.IsLetterOrDigit(e.KeyChar) Then
            e.Handled = False
        Else
            e.Handled = True
        End If
 End Sub
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