I need the logic to check whether the user is login ?

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C#

Hi i'm developing an Matrimony Website.

At Present i didn't set ant criteria.Who ever visit my page he/she can see all the available profiles.


Actually now what i want is,once the the user is jump into the site he can see only 50 profiles initially.if he click the next button after reach 50 it should check whether the user is logged in if he has logged in it should takes him to next page else it should say as "please login".

Can anyone help me to achieve this?

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;


public partial class brideview : System.Web.UI.Page
{
    
    string cmd;
    int pos;
    string gender, from, to, religion,category;
    protected void Page_Load(object sender, EventArgs e)
    {
        gender = Request.QueryString["Gender"].ToString();
        from = Request.QueryString["from"].ToString();
        to = Request.QueryString["to"].ToString();
        religion = Request.QueryString["religion"].ToString();
        category = Request.QueryString["category"].ToString();
        if (!IsPostBack)
        {
            ViewState["vs"] = 0;
        }
        pos = (int)this.ViewState["vs"];
        listing();

    }
    void listing()
    {
        try
        {
            cmd = "select distinct r.id,r.name,r.age,'~/TB_Photos/'+[PhotoName] as Url, '~/Photos/'+[PhotoName] as ImageFullUrl,r.Religion,r.landline,r.e_mail,r.country,p.education,p.income,p.occupation from registration r inner join profession p on p.id=r.id where Gender='" + gender + "' and status='active'";
            if (from.ToString() != "--Select--" && to.ToString() != "--Select--")
            {
                cmd = cmd + " and age between " + Convert.ToInt32(from) + " and " + Convert.ToInt32(to);
            }
            if (religion.ToString() != "--Select--")
            {
                cmd = cmd + " and religion='" + religion + "'";
            }
            if (category.ToString() != "--Select--")
            {
                cmd = cmd + " and occupation='" + category + "'";
            }
            cmd = cmd + " order by id desc";
            SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());
            con.Open();
            SqlDataAdapter dadapter;
            dadapter = new SqlDataAdapter(cmd, con);
            DataSet dset = new DataSet();
            PagedDataSource adsource = new PagedDataSource();
            dadapter.Fill(dset);
            adsource.DataSource = dset.Tables[0].DefaultView;
            adsource.PageSize = 50;
            adsource.AllowPaging = true;
            adsource.CurrentPageIndex = pos;
            lbtnPrev.Enabled = !adsource.IsFirstPage;
            lbtnNext.Enabled = !adsource.IsLastPage;
            DataList1.DataSource = adsource;
            DataList1.DataBind();

            con.Close();
            con.Dispose();

        }
        catch (Exception ex)
        {

            //Response.Write(ex.Message);
        }
    }
    protected void lbtnPrev_Click(object sender, EventArgs e)
    {
        pos = (int)this.ViewState["vs"];
        pos -= 1;
        this.ViewState["vs"] = pos;
        listing();
    }
    protected void lbtnNext_Click(object sender, EventArgs e)
    {
        if (System.Web.HttpContext.Current.User.Identity.IsAuthenticated)
        {
            pos = (int)this.ViewState["vs"];
            pos += 1;
            this.ViewState["vs"] = pos;
            listing();
        }
    }
}

This is my code...

when i click

lbtnNext_Click

it should verify that the user is logged in or not?
is there any eg: for using session.

I dont know how and where to use session :(


Thanks in advance.