In method overloading method performs the different task at the different input

parameters with same method name and in same class.  

Example

To explain the concept of overloading I have created two classes Poly

    public class poly
    {
//these two functions, sum(), are overloaded.
        public int sum(int x, int y)
        {
            return (x + y);
        }
        public virtual int sum(int x, int y, int z)
        {
            return (x + y + z);
        }
    }