Difference between string and stringbulder c#

String:
Its a class used to handle strings. String object is used to concatenate two strings. Strings are immutable.Slower

String Builder:

This is also the class used to handle strings.Here Append method is used. String Builder is mutable.Faster [spam link removed]

Please take a look here,
http://stackoverflow.com/questions/3069416/difference-between-string-and-stringbuilder-in-c-sharp

It might help you,

StringBuilder vs. String / Fast String Operations with .NET 2.0[^]

:)

StringBuilder is a mutable class, meaning you can insert/append/replace/etc. without creating a new StringBuilder each time.
String is immutable, each time you perform an operation that "changes" it you are creating a new string to replace the old one.
As mentioned above multiple times, that makes the StringBuilder more efficient for operations that manipulate strings.

This article goes a bit more into the details than the note posted at dotnetuncle
String Vs StringBuilder (C#)[^]

A StringBuilder wears a hardhat, a string doesn't. Seriously though...

A string is deleted and reallocated when you concatenate it, where a StringBuilder isn't. StringBuilders are much more efficient.

BTW, google is free, and this is an easily found answer there.

There is an answer to the question here; http://www.dotnetuncle.com/difference/41_string_stringbuilder.aspx[^]

In its simplest form, basically stringbuilder is more efficient at handling string concatenation operations.