Program:

The source code to demonstrate the use of Add() method of TimeSpan structure is given below. The given program is compiled and executed successfully.

using System;

class TimeSpanDemo
{
    //Entry point of Program
    static public void Main()
    {
        //Here we create timespan with day,hour,minutes and seconds
        TimeSpan timespan1 = new TimeSpan(4,2, 20, 0);
        TimeSpan timespan2 = new TimeSpan(2,2, 10, 0);
        TimeSpan timespan3;

        timespan3 = timespan1.Add(timespan2);

        //Sum of timespan1 and timespan2 
        Console.WriteLine("Sum of timespan1 and timespan2 : "+timespan3); 
    }
}

Output:

Sum of timespan1 and timespan2 : 6.04:30:00
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