I am reading Begining Visual C# 2005. I encounted a question about the following part. Anyone help me out? see the comments!

using System;
using System.Collections.Generic;
using System.Text;

namespace Ch10Ex01
{
    class MyClass
    {
        public readonly string Name;
        private int intVal;

        public int Val
        {
            get { return intVal; }
            set
            {
                if (0 <= value && value <= 10)
                    intVal = value;
                else
                    throw (new ArgumentOutOfRangeException("Val", value,
                        "Val must be assigned a value between 0 and 10."));
            }
        }
        public override string ToString()
        {
            return "Name: " + Name + "\nVal: " + Val;
        }
        private MyClass()
            : this("Default Name") /*Explaination in the book:Note that I've used this("Default Name") to ensure that Name gets a value if this constructor ever gets called, which is possible if this class is used to derive a new class. This is necessary as not assigning a value to the Name field could be a source of errors later.*/

/* What's puzzling me: How can it be used in a derived class as it's "private"? What does this("Default Name") mean? How does the object get the "Default Name" as its name? */
        {

        }
        public MyClass(string newName)
        {
            Name = newName;
            intVal = 0;
        }
    }
}