string is immutable and stringbuilder is mutable

Question

can any one explain with examples

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Related Discussion: Most efficient way to concatenate strings?

Answer 1

String is immutable ,,

That means we cannot change the string once declared .

String builder is mutable

This is the variety operation can be performed.we can change string ..

Answer 2

You cannot edit the value of a string, each method of the string object returns a new string instead of altering the original. StringBuilder on the other hand can alter it's content (adding new strings for example).

string original = "the brown fox jumped over the lazy dog";
string altered = original.Insert(original.IndexOf("fox"), "cat");
// altered = the brown cat jumped over the lazy dog

You cannot change the content of the original string unless you create a new string, or re-reference the instance to another string object.