System.ComponentModel.MaskedTextProvider.IsAscii C# (CSharp) Method

        private static bool IsAscii(char c)
        {
            //ASCII non-control chars ['!'-'/', '0'-'9', ':'-'@', 'A'-'Z', '['-'''', 'a'-'z', '{'-'~'] all consecutive.
            return (c >= '!' && c <= '~');
        }