i want to move or delete the data when system date = last da

i want to move or delete the data when system date = last date

code part-

using System;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void btncreat_Click(object sender, EventArgs e)

{

int Totaldays = duration(txtstart.Text, txtEnd.Text);

diffrence.Text = Convert.ToString(Totaldays);

}

public int duration(string startdate, string enddate)

{

DateTime dt1 = DateTime.Parse(Convert.ToDateTime(txtstart.Text).ToString("MM/dd/yyyy"));

DateTime dt2 = DateTime.Parse(Convert.ToDateTime(txtEnd.Text).ToString("MM/dd/yyyy"));

TimeSpan ts = dt2.Subtract(dt1);

int days = ts.Days;

return days;

if (txtEnd.Text == System.DateTime)

{

}

design part

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

Untitled Page

<%--

--%>