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Difference between String and string in C#?

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

string is an alias for System.String. So technically, there is no difference. It’s like .

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);

This is the style that Microsoft tends to use in [their examples](http://msdn.microsoft.com/en-us/library/fht0f5be.aspx#ctl00%5Frs1%5FmainContentContainer%5Fctl110CSharp).