Char.IsDigit Method (String, Int32)
Indicates whether the character at the specified position in a specified string is categorized as a decimal digit.
Assembly: mscorlib (in mscorlib.dll)
This method determines whether a Char is a radix-10 digit. This contrasts with IsNumber, which determines whether a Char is of any numeric Unicode category. Numbers include characters such as fractions, subscripts, superscripts, Roman numerals, currency numerators, encircled numbers, and script-specific digits.
Character positions in a string are indexed starting from zero.
Valid digits are members of the UnicodeCategory.DecimalDigitNumber category.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.