Implicitly and Explicitly calling default constructor of a class in C# 3.0

Hi, I have 2 questions about C# 3.0.......

What is the difference between
"implicitly calling the default constructor"
and
"explicitly calling the default constructor"
of a class?

Any advantages or reason to use a particular one?
(see attached code snippet)

class Program
    {
        static void Main(string[] args)
        {
            // example 1, old school
            MyClass mclass1 = new MyClass();
            Console.WriteLine(mclass1.mystring);

            //example 2, new with C# 3.0, implicitly calls the classes default constructor.
            MyClass mclass2 = new MyClass { mystring = "test2" };
            Console.WriteLine(mclass2.mystring);

            //example 2, new with C# 3.0, explicitly calls the classes default constructor.
            MyClass mclass3 = new MyClass () { mystring = "test3" };
            Console.WriteLine(mclass3.mystring);

            Console.ReadLine();
        }
    }

    class MyClass 
    {
        public string mystring { get; set; }
    }

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