Cancel adding character to TextBox?

Question

.NET

Hello. I'm making a Windows Forms application.
There is a field. You need to enter certain characters into it. (MaskedTextBox not suggested)
In general, the PreviewKeyDown event checks the character that was just pressed (Convert.ToChar(e.KeyValue)). It is necessary that I could control the very addition of a character to the TextBox. When necessary, canceled, and when necessary, allowed to add.
It would be possible to pass e.KeyData = Keys.None, thereby canceling the pressed key, but all properties are read-only.

Answer 1

In the KeyPress handler for objectionable
e.Handled = true;

Answer 2

if-else