Aunthentication with login for different users in ASP>NET

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ASP.NET

I have a login that I have been working on. The login works but I want to change somethings. I want to authenticate between users of the program. Every user has a username and password. They also have an ID. I want to authenticate with the ID to show a page just for that user. Right now it works with the levels. I gave each test user a different level. How can I use the ID to give them the same access but show them a page just for them? And how can that page only show their profile and no one else? Here is the code I have:

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;
using System.Configuration;
using System.Data;


public partial class Login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        
    }

    protected void Button1_Click(object sender, EventArgs e)
    {

        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["PasswordConnectionString"].ConnectionString);
        con.Open();

        if (true)
        {
            SqlCommand level = new SqlCommand("select AccessLevel, Password from TableSecurity where EmailAddress = @EmailAddress AND Password = @Password", con);
            level.Parameters.Add(new SqlParameter("EmailAddress", TextBoxEA.Text));
            level.Parameters.Add(new SqlParameter("Password", TextBoxPW.Text));

            SqlDataReader reader = level.ExecuteReader();
            DataTable dt1 = new DataTable();
            dt1.Load(reader);

            foreach (DataRow dr1 in dt1.Rows)
            {
                int returnedLevel = Convert.ToInt32(dr1[0].ToString());

                if (returnedLevel == 1)
                {
                    Response.Redirect("FormAPublic.aspx");
                }
                else if (returnedLevel == 2)
                {
                    Response.Redirect("FormCPrivateNon.aspx");
                }
                else if (returnedLevel == 3)
                {
                    Response.Redirect("FormDPrivateFor.aspx");
                }
                else if (returnedLevel == 7)
                {
                    Response.Redirect("CEOPage.aspx");
                }
                else if (returnedLevel == 8)
                {
                    Response.Redirect("DBPage.aspx");
                }
            }
        }
        con.Close();
    }
    
}