data retriving from sql

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.Data;

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

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(@"Data Source=CODEM-PC;Initial Catalog=technology;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False");
        SqlCommand cmd = new SqlCommand(("select *  from anvesh"), con);
        con.Open();
      
       
        using (SqlDataReader dr = cmd.ExecuteReader())
        {
            while (dr.Read())
            {
                if (dr.Read())
                {
                    fn.Text = dr["firstName"].ToString();
                    ln.Text = dr["lastName"].ToString();
                    un.Text = dr["username"].ToString();
                    p.Text = dr["password"].ToString();
                    dob.Text = dr["dob"].ToString();
                    g.Text = dr["gender"].ToString();
                    m.Text = dr["mobile"].ToString();
                    Label1.Text = dr["email"].ToString();
                }
            }
        }
        
        


        cmd.ExecuteNonQuery();
        con.Close();

    }
}