What is the difference between String and string?

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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.
e.g.

string place = "world";

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

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