sstrings

A full description is given (most times) in the help system of the language you are using, so if it is C# then the help incorporated in the IDE (VS 2008, 2009, VB etc) will give you the usage and maybe an example of the string function.

Press F1 for help...

The String class represents textual data, i.e., a series of Unicode characters; but, a String object is actually a sequential collection of System.Char objects. The value of the char is the content of the collection; and, the value is immutable.

String Methods  in C#.

ToLower: converts the instance to lower case
ToUpper: converts the instance to upper case
Substring: extracts a portion of the instance based on begin and end points
IndexOf: calculates the position of a specified character in the instance
Remove: deletes a portion of the instance based on begin and end points
StartsWith: determines whether the beginning of the instance matches a specified string
Replace: replaces a portion of the instance with a specified string

Below is the C# code demonstrating the String Methods. If you right-click and Open in New Window, the code is more readable.

There is an abundant amount of string methods in the C# language. This post just barely skims the surface.

More about String Class
Use of String Method
More examples string method


String vs StringBuilder