How to Calculate Difference between two dates in C#.NET

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace Difference_Date

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void btncal_Click(object sender, EventArgs e)

        {

            DateTime sdt = dtpstart.Value.Date;

            DateTime edt = dtpend.Value.Date;

            TimeSpan ts = edt - sdt;

            int days = ts.Days;

            lbldifftwodatevalue.Text = days.ToString() + " Days";

        }

    }

}