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In C#, what is the difference between String and string?

In C#, what is the difference between String and string?

Example:
string s = "Hello, World";
String S = "Hello, World";

string is an alias for System.String. So technically, there is no difference. It's like int vs. System.Int32. As far as guidelines, I think it's generally recommended to use string any time you're referring to an object.

 Example:
string place = "world";

Likewise, I think it's generally recommended to use String if you need to refer specifically to the class.

 Example:
string greet = String.Format("Hello {0}!", place);

This is the style that Microsoft tends to use in their examples.

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