Difference between String and Stringbuilder in Asp.net - c#

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Here I will happy to explain what is difference between string and stringbuilder in asp.net using C#.

String	StringBuilder
It’s an immutable(means once we create   string object we cannot modify)	It’s mutable(means once we create string builder object we can perform any operation like insert, replace or append)
In string we do not have append keyword	In StringBuilder we can use append keyword
String is slow performance wise because every time it will create new instance	stringbuilder is high performance wise because it will use same instance of object to perform action like insert, replace or append
String belongs to System namespace	Stringbuilder belongs to System.Text namespace
Example string strTest = "hello"; strTest += "wow"; // create a new string instance strTest += "nice"; // create a new string instance	Example StringBuilder sb = new StringBuilder("hello"); sb.Append("wow"); sb.Append("nice"); string strTest = sb.ToString();