how disable back button in c# code

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hi there..
in my project a user can sign in and access her home.aspx page and can hit signout link_button for signout, but when back button pressed then again home.aspx page is shown there.
I want that when signout button clicked then it go to login page and back is disabled.. How can i treat it in pagebehind C#. i mean when signout link button pressed a matthod is called that disable the back button.....
please give me some code for C# to disable back

my code is---

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;

public partial class MasterPage : System.Web.UI.MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
if (Session["expire"] == "True")
{
//
//WHAT SHOULD I WRITE HERE
//
}
SqlConnection con = new SqlConnection("server=.\\SQLEXPRESS; AttachDbFileName=|DataDirectory|\\Database.mdf; user instance=true; trusted_connection=yes");
con.Open();
SqlCommand cmd = new SqlCommand("SELECT fn,ln FROM signup WHERE id='"+Session["User"]+"'",con);
SqlDataReader rd = cmd.ExecuteReader();
while (rd.Read())
{
Label1.Text = rd.GetString(0).ToString();
Label2.Text = rd.GetString(1).ToString();
}

}

protected void LinkButton1_Click(object sender, EventArgs e) //for Signout
{
Session["User"] = "";
Session["expire"] = "True";
Response.Redirect("login.aspx");
}

}

here LinkButton1_Click for signout. As Signout Clicked session["expired"] goes true.
as sign button clicked loginpage displayed. NOW as back button is clicked so this page is loded again and session["expire"]=true checked ... so in pageload field what should i write so that back cannot load it again...

Posted 16-Aug-12 21:21pm

prafullasaxena1991

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4 solutions

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Abhai Oza · Answer 1 · 2012-08-16T21:25:00

Solution 1

Check This Page..

http://forums.asp.net/t/245388.aspx/1[^]

Posted 16-Aug-12 21:25pm

Abhai Oza

Code-Hunt · Answer 2 · 2012-08-16T21:32:00

Solution 2

XML

<script language="JavaScript">
window.history.forward(1);
</script>

Try this..

Posted 16-Aug-12 21:32pm

Code-Hunt

Santhosh Kumar Jayaraman · Answer 3 · 2012-08-16T21:38:00

Solution 3

There are already so many threads about this..

Disable back button functionality when user logged out[^]

Disable Browser Back Button functionality after click on Logout Button[^]

how to disable back button in asp.net[^]

Posted 16-Aug-12 21:38pm

Santhosh Kumar Jayaraman

ridoy · Answer 4 · 2012-08-16T21:44:00

I can give you the code because i also face that problem and solve it using session.You need to clear the session of browser when you log out from your page.
After successfull login in page load event add these lines..

C#

Response.ClearHeaders();
Response.AddHeader("Cache-Control", "no-cache, no-store, max-age=0, must-revalidate");
Response.AddHeader("Pragma", "no-cache");

and then in log out button code write..

C#

Response.Redirect("Login.aspx");

Session.Abandon();
Session.Clear();