if (!Enumerable.Contains<char>((IEnumerable<char>) str1, e.KeyChar)) e.KeyChar = Convert.ToChar(0); if (!Enumerable.Contains<char>((IEnumerable<char>) str2, e.KeyChar) && !this.CTRL && !this.ALT) e.KeyChar = Convert.ToChar(0);
if (!str1.Contains(e.KeyChar.ToString())) e.KeyChar = Convert.ToChar(0); if (!str2.Contains(e.KeyChar.ToString()) && !this.CTRL && !this.ALT) e.KeyChar = Convert.ToChar(0);
var
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