Custom Numeric Format Strings in C#

You can create a custom numeric format string, which consists of one or more custom numeric specifiers, to define how to format numeric data. A custom numeric format string is any format string that is not a standard numeric format string.
Custom numeric format specifiers are supported by all of the numeric types in the .NET Framework class library. These include the BigInteger, Byte, Decimal, Double, Int16, Int32, Int64, SByte, Single, UInt16, UInt32, and UInt64 types.