TextBox limitare l'inserimento di alcuni carratteri

private void tuaTextBox_KeyPress(object sender, KeyPressEventArgs e)
{
 List<char> unacceptedChars = new List<char>
  (new char[] { '!', '"', '£', ', '%', '&', ecc });

 if (unacceptedChars.Contains(e.KeyChar))
 {
  e.Handled = true;
 }
}

If Not (Char.IsSimbol(e.KeyChar)) and (Char.isPunctuation(e.KeyChar)) Then 
            e.Handled = True
        End If

If (e.KeyChar > Chr(47) And e.KeyChar < Chr(58)) Or e.KeyChar = Chr(8) Then
            e.Handled = False
        Else
            e.Handled = True
        End If 

If (e.KeyChar > Chr(64) And e.KeyChar < Chr(122)) Or e.KeyChar = Chr(8) Then
            e.Handled = False
        End If

If (e.KeyChar > Chr(96) And e.KeyChar < Chr(122)) Or e.KeyChar = Chr(8) Then
            e.Handled = False
        Else
            e.Handled = True
        End If

'non accettare carratteri speciali
        If Not (Char.IsSymbol(e.KeyChar)) And (Char.IsPunctuation(e.KeyChar)) Then
            e.Handled = True
        End If
        'accettare solo lettere
        If (Char.IsNumber(e.KeyChar)) Then
            e.Handled = True
        End If

If Not Char.IsLetter(e.KeyChar) Then
 e.Handled = True
End If

If Not (Char.IsLetter(e.KeyChar) Or _
 Char.IsWhiteSpace(e.KeyChar)) Then
  e.Handled = True
End If