String vs string

In C# there are String objects and string objects.

What is the difference between the two? What are the best practices regarding which to use?

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There is no difference. string (lower case) is just an alias for System.String.

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No difference. System.String is strictly identical to string . Common C# coding guidelines indicates that you should use the keyword string .

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They are aliases and are interchangeable. However, stylistically, for declarations, I use the lowercased string, and for the static methods, I use String.

string foo = "bar";

if( foo != String.Empty )
{
   Console.WriteLine(String.Format("foo.Length = {0}", foo.Length));
}

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