Formatting Standard Numeric Format Strings http://msdn.microsoft.com/en-us/library/s8s7t687(VS.80).aspx
Formatting Custom Numeric Format Strings http://msdn.microsoft.com/en-us/library/0c899ak8.aspx
Formatting Numeric Format Strings (Alignment)
-Integer http://www.csharp-examples.net/string-format-int/
-Double http://www.csharp-examples.net/string-format-double/
-DateTime http://www.csharp-examples.net/string-format-datetime/
-Align String with Spaces http://www.csharp-examples.net/align-string-with-spaces/
-Indent String with Spaces http://www.csharp-examples.net/indent-string-with-spaces/
-IFormatProvider http://www.csharp-examples.net/iformatprovider-numbers/
-Custom IFormatProvider http://www.csharp-examples.net/custom-iformatprovider/