How does the c# compiler concat strings [duplicate]

Question

Possible Duplicate:
Does C# optimize the concatenation of string literals?

string foo = "bar1" + "bar2" + "bar3";

Does the c# compiler internally apply the string.Concat method ?

Then it would be better to use the + operator for the readability sake.

Answer 1

With literals, this is equivalent to:

string foo = "bar1bar2bar3";

No concatenation is performed- they are combined at compile time into a constant.