String.Format method

String.Format method

1. Double.ToString Method (String)
2. Get the decimal part from a double
3. Dynamic number format in .NET?
4. How do I format a Decimal to a programatically controlled number of decimals in c#?
5. Formatting double as string in C#
6. Get the decimal part from a double
7. String Format for DateTime [C#]
8. Custom Date and Time Format Strings
9. DateTime format.

this link contains a good idea to convert to YYYY-MM-DD format:

10. How to Convert Current Date into string "yyyyMMdd" like "20061113"