Difference between String and string

Let's Discuss difference between

                    String  and  string in c#

in one word :-

                          String is a class in dotnet class library

                          

                          string is a keyword

illustration ::

                    Here we go,consider the following program

//program1 
//program for just declaring a string variable 
using System; 
class Program 
{ 
static void Main(string[] args) 
  { 
  String str = "string vs String"; 
  } 
}

above program will run without any error but doesn't have any output.

Now  i remove the namespace System from the program,the code will looks like

//program2 
//program for just declaring a string variable 
class Program 
{ 
static void Main(string[] args) 
  { 
  String str = "string vs String"; 
  } 
}

if i try to run the program it will shows following error message

from the above two program we understood that

• String is class inside System Namespace
• Since You must import System to use String

Now if i replace String with string in program2 as below

//program3 
//program for just declaring a string variable 
class Program 
{ 
static void Main(string[] args) 
{ 
string str = "string vs String"; 
} 
}

program will run perfectly,So we may Conclude that

string keyword = System.String class

As always keywords always make the things more Simple.That means you can use variables of type string without using System namespace.

Done

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