how to give authentication to login page in asp.net

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Hi,
in my project i have login.aspx page and welcome.aspx page, when enter the credentials
and logged in, navigated to welcome.aspx page and in welcome.aspx page i have logout button, when i clicked on logout button, it navigated to login.aspx.but in browser i clicked button it is navigating to welcome.aspx page. so i want to clear the cookie or session, how to do this
send me the example..

Posted 22-Mar-12 2:50am

parashu durgam

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Mukund Thakker · Answer 1 · 2012-03-22T03:51:00

Please refer following code,

After successful login add following code to add user data in session.

C#

HttpContext.Current.Session["UserID"] = data.UserId;
        HttpContext.Current.Session["Email"] = data.Email;

Add following code in master page.

C#

public bool checkAuthentication
    {
        get;
        set;
    } 

protected void Page_Load(object sender, EventArgs e)
    {        
        if (checkAuthentication)
        {
            if ((Session["UserID"] + "") == "")
            {
                Response.Write("<script type=\"text/javascript\">" +
                        "window.parent.location = '" + ConfigurationManager.AppSettings["SiteUrl"] + "login?loginUrl=' + window.parent.location + '&mode=session';" +
                                "</script>");
                Response.End();
            }
        }
}

Add following code in each child page where you want to authenticate user session.

C#

protected void Page_PreInit(object sender, EventArgs e)
    {
        this.Master.checkAuthentication = true;
    }

On click of logout button redirect to logout page.
Add following code on page load of logout.aspx

C#

protected void Page_Load(object sender, EventArgs e)
   {
       Session.Abandon();
       Response.Redirect(ConfigurationManager.AppSettings["SiteUrl"] + "login?mode=logout",true);
   }

Hope this may help you.

Rahul Rajat Singh · Answer 2 · 2012-03-22T02:53:00

Solution 1

Have a web.config to prevent the user to access the welcome page unless he is logged in.

alternatively in welcome.aspx.cs page_load check if no user is logged in redirect to login page.

Posted 22-Mar-12 2:53am

Rahul Rajat Singh