Difference Between String and StringBuilder In C#

C# tutorial on the difference between string and StringBuilder(string vs StringBuilder).

Main Differences.

1) NameSpace

StringBuilder belongs to System.Text Namespace and that of the string is System.

2) Mutability and Immutability

String is mutable and StringBuilder is immutable.

The mutability of string can be explained as a process for creating new instances when an operation on it changes its value. While StringBuilder does not create new fresh instances like a string instead it overwrite existing instance.

3) Performance

StringBuilder is more efficient than string in c#. Since it doesn't create garbage instances after each operation on it.while in string operation it creates useless intermediate instances.

One Last Point

String won't create new instance all the time.it creates a new instance only when the operation changes its value. So concatenating empty string won't create a new instance.

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