What is the real significance of new modifier in C# [duplicate]

From the code below I wanted to know What is the difference between MyMethod2() and MyMethod3(). Why has .net provided does not give compile error for not mentioning the new keyword or in other words why has .net provided new keyword, if both implemnetation are same.

public class MyBase
{
    public virtual void MyMethod2()
    {
         //do something
    }
    public virtual void MyMethod3()
    {
        //do something
    }
}

public class MyDerived :MyBase
{
    public void MyMethod2()
    {
        base.MyMethod2();
    }
    public new void MyMethod3()
    {
        base.MyMethod3();
    } 
}


   static void Main开发者_如何学运维(string[] args)
    {

        MyBase myClass = new MyDerived();
        myClass.MyMethod2(); //calls base class
        myClass.MyMethod3(); //calls base class
    }

It won't give you a compile error, but it will give you a warning, and act as though you'd used the new keyword.