login and logout on each page

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ASP.NET

Hello to all.

I am making an asp.net web application an I want to give the user the facility to login and logout on every page.

I have taken two image buttons on masterpage one is of login and second of logout.

I have two pages first is default which is created by master page and second is login which is not created by master page. Now when default page open it is written...

"Welcome:guest".

When I click on login after successfully logging in it returns to default page written as...

"Welcome:guest" instead of "Welcome:(username)"


I'ts not coming when I click again on login button after that it comes

Welcome:(username)"


This is my coding please tell me where I am getting the error.

1)Default page

protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["cname"] != null)
        {
            Label lb = new Label();
            lb = (Label)Master.FindControl("Label2");
            lb.Text = Session["cname"].ToString();
            ImageButton ib = new ImageButton();
            ib = (ImageButton)Master.FindControl("ImageButton1");
            ib.Visible = false;
            ImageButton img = new ImageButton();
            img = (ImageButton)Master.FindControl("ImageButton2");
            img.Visible = true;

        }
    }

2)Login page

protected void imglogin_Click(object sender, ImageClickEventArgs e)
    {
        if (rb1.SelectedIndex == 1)
        {
            string uname,upas;
            uname= txtuname.Text;
            upas = txtpas.Text;
            SqlCommand cmd = con.CreateCommand();

            cmd.CommandText = "select * from customer where email="+"'"+uname+"'";

            SqlDataReader dr = cmd.ExecuteReader();

            if (dr.Read())
            {
                Session["cname"] = dr.GetString(1);

                 string script = "<script>RowDblClick1()</" + "script>";
                ScriptManager.RegisterStartupScript(this, this.GetType(), "RowDblClick1", script,

false);

            }
            else
            {
                Response.Write("<script>alert('Invalid username or password.')</script>");
            }

        }
        if (rb1.SelectedIndex == 2)
        {

            if ((txtuname.Text == "kshama") && (txtpas.Text == "123"))
            {
                Session["admin"] = "Admin";
                string script = "<script>RowDblClick1()</" + "script>";
                ScriptManager.RegisterStartupScript(this, this.GetType(), "RowDblClick1", script,

false);


            }


        }


    }

3)Master Page

protected void Page_Load(object sender, EventArgs e)
   {
       ViewState["pageurl"] = Request.CurrentExecutionFilePath;
       Label lb = new Label();
       lb= (Label)Master.FindControl("Label2");
       Session["ab"] = lb;
   }
   protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
   {
           if (Session["cname"] != null)
           {
               ImageButton1.Visible = false;
               ImageButton2.Visible = true;
               Label2.Text = Session["cname"].ToString();
               Response.Redirect(ViewState["pageurl"].ToString());
           }
           if (Session["admin"] != null)
           {
               ImageButton2.Visible = true;
               ImageButton1.Visible = false;
               Response.Redirect("admin.aspx");
           }
           else
           {
               RadWindowManager RadWindowManager2 = new RadWindowManager();
               RadWindowManager2.VisibleStatusbar = false;
               RadWindowManager2.Skin = "Sunset";
               RadWindowManager2.Behaviors = WindowBehaviors.Close;
               RadWindowManager2.Animation = WindowAnimation.FlyIn;
               RadWindow rd = new RadWindow();
               rd.ID = "a1";
               rd.VisibleOnPageLoad = true;
               rd.NavigateUrl = "logins.aspx";
               RadWindowManager2.Windows.Add(rd);
               Panel1.Controls.Add(RadWindowManager2);
           }

   }
   protected void ImageButton2_Click(object sender, ImageClickEventArgs e)
   {
       if (Session["cname"] != null)
       {
           //ImageButton1.Visible = true;
           Session.Remove("cname");
           Response.Redirect(ViewState["pageurl"].ToString());
       }
       if (Session["admin"] != null)
       {
           //ImageButton1.Visible = true;
           Session.Remove("admin");
           Response.Redirect("default.aspx");
       }
   }