| Method | Meaning |
| public int CompareTo(object v) | Returns zero if the characters are equal. Returns a negative value if the invoking object has a lower value. Returns a positive value if the invoking object has a greater value. |
| public override bool Equals(object v) | Returns true if the value of the invoking object equals the value of v. |
| public override int GetHashCode() | Returns the hash code for the invoking object. |
| public static double GetNumericValue(char ch) | Returns the numeric value of ch if ch is a digit. Otherwise, returns -1. |
| public static doubleGetNumericValue(string str, int idx) | Returns the numeric value of str[idx] if that character is a digit. Otherwise, returns -1. |
| public TypeCode GetTypeCode() | Returns the TypeCode enumeration value for Char, which is TypeCode.Char. |
| public static UnicodeCategoryGetUnicodeCategory(char ch) | Returns the UnicodeCategory enumeration value for ch. UnicodeCategory is an enumeration defined by System.Globalization that categorizes Unicode characters. |
| public static UnicodeCategoryGetUnicodeCategory(string str, int idx) | Returns the UnicodeCategory enumeration value for str[idx]. UnicodeCategory is an enumeration defined by System.Globalization that categorizes Unicode characters. |
| public static bool IsControl(char ch) | Is ch a control character. |
| public static bool IsControl(string str, int idx) | Is str[idx] a control character. |
| public static bool IsDigit(char ch) | Is ch a digit. |
| public static bool IsDigit(string str, int idx) | Is str[idx] a digit. |
| public static bool IsLetter(char ch) | Is ch a letter of the alphabet. |
| public static bool IsLetter(string str, int idx) | Is str[idx] a letter of the alphabet. |
| public static bool IsLetterOrDigit(char ch) | Is ch either a letter of the alphabet or a digit. |
| public static boolIsLetterOrDigit(string str, int idx) | Is str[idx] either a letter of the alphabet or a digit. |
| public static bool IsLower(char ch) | Is ch a lowercase letter of the alphabet. |
| public static bool IsLower(string str, int idx) | Is str[idx] a lowercase of the alphabet. |
| public static bool IsNumber(char ch) | Is ch a hexadecimal digit, which is 0 through 9 or A through F. |
| public static bool IsNumber(string str, int idx) | Is str[idx] a hexadecimal digit, which is 0 through 9 or A through F. |
| public static bool IsPunctuation(char ch) | Returns true if ch is a punctuation character. Otherwise, returns false. |
| public static boolIsPunctuation(string str, int idx) | Is str[idx] a punctuation character. |
| public static bool IsSeparator(char ch) | Is ch a separator character, such as a space. |
| public static bool IsSeparator(string str, int idx) | Is str[idx] a separator character, such as a space. |
| public static bool IsSurrogate(char ch) | Is ch a Unicode surrogate character. |
| public static bool IsSurrogate(string str, int idx) | Is str[idx] a Unicode surrogate character. |
| public static bool IsSymbol(char ch) | Is ch a symbolic character, such as the currency symbol. |
| public static bool IsSymbol(string str, int idx) | Is str[idx] a symbolic character, such as the currency symbol. |
| public static bool IsUpper(char ch) | Is ch an uppercase letter. |
| public static bool IsUpper(string str, int idx) | Is str[idx] an uppercase letter. |
| public static bool IsWhiteSpace(char ch) | Is ch a whitespace character, such as a space or tab. |
| public static boolIsWhiteSpace(string str, int idx) | Is str[idx] a whitespace character, such as a space or tab. |
| public static char Parse(string str) | Parse the string. If str contains more than one character, a FormatException is thrown. |
| public static char ToLower(char ch) | Returns the lowercase equivalent of ch if ch is an uppercase letter. Otherwise, ch is returned unchanged. |
| public static charToLower(char ch, CultureInfo c) | Returns the lowercase equivalent of ch if ch is an uppercase letter. Otherwise, ch is returned unchanged. The conversion is handled in accordance with the specified cultural information. CultureInfo is a class defined in System.Globalization. |
| public static char ToUpper(char ch) | Returns the uppercase equivalent of ch if ch is a lowercase letter. Otherwise, ch is returned unchanged. |
| public static char ToUpper(char ch,CultureInfo c) | Returns the uppercase equivalent of ch if ch is a lowercase letter. Otherwise, ch is returned unchanged. The conversion is handled in accordance with the specified cultural information. CultureInfo is a class defined in System.Globalization. |
| public override string ToString() | Returns the string representation of the value of the invoking Char. |
| public static string ToString(char ch) | Returns the string representation of ch. |
| public string ToString(IFormatProvider fmtpvdr) | Returns the string representation of the invoking Char using the specified culture information. |