C# PreviewKeyDown Event - Allow Special Characters

Hello,
I have a textbox and a PreviewKeyDown Event in which i want to allow Special Characters,A-Z and 0-9 only. Other keys such as keyboard modifiers, F1-F12, Esc,Tab, etc are not allowed.
private void PART_SearchText_PreviewKeyDown(object sender, KeyEventArgs e)
TextBox searchTextBox = sender as TextBox;
if (((e.Key >= Key.A && e.Key <= Key.Z)
|| (e.Key >= Key.D0 && e.Key <= Key.D9)
|| (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)
|| (e.Key == Key.Back || e.Key == Key.Delete))
&& (Keyboard.Modifiers != ModifierKeys.Shift)
&& (Keyboard.Modifiers != ModifierKeys.Alt)
&& (Keyboard.Modifiers != ModifierKeys.Control)
&& (Keyboard.Modifiers != ModifierKeys.Windows)
&& (searchTextBox.SelectedText.Length > 0 && searchTextBox.Text.Length > 0)
&& (searchTextBox.SelectedText.Length == searchTextBox.Text.Length))
if (SearchDeletionCommand != null)
searchTextBox.IsReadOnly = false;
SearchDeletionCommand.Execute(null);
The issue I am facing when hitting special characters (!,@,#...).
So on my laptop if i press Shift 1, i am eventually entering a punctuation mark (!) and that should work. But in above code what happens is that the conditions does not get satisfied.
Thanks,
Abdi

Thanks.
I was thinking to use ascii values.
private void PART_SearchText_PreviewKeyDown(object sender, KeyEventArgs e)
TextBox searchTextBox = sender as TextBox;
int ascii = KeyInterop.VirtualKeyFromKey(e.Key);
if (ascii >= 32 && ascii <= 127 && (searchTextBox.SelectedText.Length > 0 && searchTextBox.Text.Length > 0)
&& (searchTextBox.SelectedText.Length == searchTextBox.Text.Length))
if (SearchDeletionCommand != null)
searchTextBox.IsReadOnly = false;
SearchDeletionCommand.Execute(null);
I am using int ascii = KeyInterop.VirtualKeyFromKey(e.Key); to get the ascii value but it does not give me the correct ascii values. For eg.. ascii value for comma is generally 88 but over here it gives me 148 or something. And that is when my
logic above fails.
Is there any workaround for this?
Thanks,
Abdi

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