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  System.Char Structure
 
 Description
A Unicode character is one that supports multiple alphabets/languages (internally, it is held as a 16 bit integer).
 
A surrogate pair cannot be represented as a single Char - only within a string of Unicode characters.
 
Important : because of this surrogate handling, a character within a string is not necessarily equivalent to a Char.
 Methods
CompareTo  Compares the current Char value to another
Equals  Determines if the current Char equals another
GetNumericValue  Tries to get the numeric value of a numeric character
IsControl  Returns true if a given character is a control character
IsDigit  Returns true if a given character is a decimal numeric digit character
IsLetter  Returns true if a given character is a letter
IsLetterOrDigit  Returns true if a given character is a letter or digit
IsLower  Returns true if a given character is lower case
IsNumber  Returns true if a given character is a numeric digit character
IsPunctuation  Returns true if a given character is a punctuation character
IsSeparator  Returns true if a given character is a separator character
IsSymbol  Returns true if a given character is a symbol character
IsUpper  Returns true if a given character is upper case
IsWhiteSpace  Returns true if a given character is a white space character
Parse  Converts a string representation of a Char into a Char value
ToLower  Converts a Unicode Char to lower case
ToString  Converts the current Char value to a string
ToUpper  Converts a Unicode Char to upper case

 Fields
MinValue  Char  0X0000
MaxValue  Char  0XFFFF

 Microsoft MSDN links
 
System
System.char
 
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