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String : is an class (system.String) and it's an reference type (class)
and
string: is an alis name of String class that is created by microsoft, it's a data type, is a c# keyword and is a complier shortcut for System.String class
so as a per above points when you use a string keyword, it reachs the System.String class , so we can say that both the (String, string ) are the same.
Regardes
both are same
"string" is an alias to System.String Class