Examples to understand string immutablility in c# [duplicate]

This means that if you assign

string s = "Hello";

you cannot modify the string s. Thus, if you do

s = "Goodbye";

the literal "Hello" is not modified, but a new literal "Goodbye" is assigned to s.

Searching on your text "strings are immutable in c#" I find: http://msdn.microsoft.com/en-us/library/362314fe.aspx

Which seems to be saying that strings are never changed objects, they are always destroyed and re-created.

Per Microsoft:

Strings are immutable--the contents of a string object cannot be changed after the 
object is created, although the syntax makes it appear as if you can do this. 
For example, when you write this code, the compiler actually creates a new string object 
to hold the new sequence of characters, and that new object is assigned to b. The string "h" 
is then eligible for garbage collection.

string b = "h";
b += "ello";