how to prevent browser back button

prasanna p

hi friends

I have login in my application.In every page I am checking Session["UserId"] is null or not.If null I am redirecting to Login page.But when user clicks on browser back button it redirects to previous page and it giving object reference error.

So how to prevent this when user clicks browser back button after logout it should display only login page.

Thanks in advance

3 Replies

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Krishna Rajput Singh10y ago
thank you for writingprasanna pbelow links helpful for you........:)
http://www.dotnetfunda.com/forums/show/14280/prevent-browser-back-button-to-redirect-to-the-previous-page-in-aspnet
http://stackoverflow.com/questions/12978285/prevent-back-button
http://www.c-sharpcorner.com/blogs/disable-browser-back-button1
Midhun Tp10y ago
Hi,

This error may be happening because you may be checking session is null as below -
if(Session["username"].ToString()!="")

You should check session is empty like below-
if(Convert.ToString(Session["username"])!="")

Also you should delete session value in logout button click using below code-
Session.Abandon();
Guest User10y ago
page 1(default.aspx)
Session["id"] = TextBox1.Text;// just the username

page 2(Default2.aspx) in page load

protected void Page_Load(object sender, EventArgs e)

{

Response.Cache.SetCacheability(HttpCacheability.NoCache);

Response.Cache.SetExpires(DateTime.Now.AddDays(-1));

Response.Cache.SetNoStore();

if (Session["id"] == null)

{

Response.Redirect("Default.aspx");// redirects to page1(default.aspx)

}

else

{

Label1.Text = (string)Session["id"];//just display user name in label

}

}
In page 2 log out button
protected void Button1_Click(object sender, EventArgs e)
{
Session["id"] = null;

Response.Redirect("/WebSite5/Default.aspx");//redirects to page1(default.aspx)
}
http://stackoverflow.com/questions/21930487/how-to-prevent-browser-back-button-after-logout