C# quiz. What will be the result of a following code execut

What will be the result of a following code execution?

 
using System; 

class App 
{ 
     static void Main() 
     { 
        string s; 
        s+="string"; 
        Console.WriteLine(s); 
    } 
 }

Explanation

Variable s is not initialized. If code looked like this

 
string s = "";
s += "string"; 
Cnsole.WriteLine(s);

then everything would have been fine, because at least some value is assigned to variable s.

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