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Example ( Look at the case ):

 string s = "Hello world!"; String s = "Hello world!";

What are the guidelines for using each? And what are the differences?

over 4 years ago · Santiago Trujillo

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Answer 1 · 2022-02-04T15:35:37.811Z

string is a C# alias for System.String .
So technically, there is no difference. It's like int vs. System.Int32

As for guidelines, it's generally recommended to use string whenever you refer to an object.

e.g

 string place = "world";

Similarly, I think using String is generally recommended if you need to refer specifically to the class.

e.g

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

This is the style Microsoft often uses in its examples .

It appears that guidance in this area may have changed, as StyleCop now requires the use of C#-specific aliases.