i got error from this project,any one can tell why is this.. error is System.web.UI.Page.SuspendLayout

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;

namespace WebRole1
{
    public partial class Userlogin : System.Web.UI.Page
    {
        SqlConnection con = new SqlConnection(@"Data Source=RAVI;Initial Catalog=multicloud;user id=sa;password=123456");
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void LinkButton1_Click(object sender, EventArgs e)
        {
            con.Open();
            SqlCommand comm = new SqlCommand("select * from users where username='" + TextBox1.Text + "' and password='" + TextBox2.Text + "'", con);
            SqlDataReader drr = comm.ExecuteReader();
            if (drr.Read())
            {
                Label1.Visible = false;
                drr.Close();

                SqlCommand comm1 = new SqlCommand("select * from users where username='" + TextBox1.Text + "' and password='" + TextBox2.Text + "' and status='YES'", con);
                SqlDataReader drr1 = comm1.ExecuteReader();
                if (drr1.Read())
                {
                    Session["username"] = TextBox1.Text;
                    Response.Redirect("Home.aspx");

                }
                else
                {
                    Label2.Visible = true;
                    Label1.Visible = false;
                }
            }
            else
            {
                Label1.Visible = true;
                Label2.Visible = false;
            }
        }
    }
}