[Use these System.Char methods] IsControl, IsDigit, IsHighSurrogate, IsLetter, IsLetterOrDigit, IsLower, IsLowSurrogate, IsNumber, IsPunctuation, IsSeparator, IsSurrogate, IsSurrogatePair, IsSymbol, IsUpper, and IsWhiteSpace [To do this] 
Determine whether a character is in a particular Unicode category such as digit, letter, punctuation, control character, and so on