What will be the output of the following C# code?

static void Main(string[] args)
{
    String obj = "hello";
    String obj1 = "world";   
    String obj2 = obj;
    Console.WriteLine(obj + "  " + obj1);
    string s = obj + "  " + obj1;
    Console.WriteLine(s.Length);
    Console.ReadLine();
}