Login.aspx.cs

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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 LoginLibrary : System.Web.UI.Page
{

    private string connString = ConfigurationManager.ConnectionStrings["LibraryConnectionString"].ToString();
    private SqlConnection sqlCon;
    private SqlDataReader sqlDa;



    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["UserName"] == null || Session["UserName"].ToString() == "")
        {
            txtName.Focus();
        }
        else
        {
            Response.Redirect("Default.aspx");
        }
    }



    protected void imgCancel_Click(object sender, ImageClickEventArgs e)
    {
        Response.Write("<script>window.close();</script>");
    }
    protected void imgSubmit_Click(object sender, ImageClickEventArgs e)
    {
        try
        {
            sqlCon = new SqlConnection(connString);
            if (sqlCon.State == ConnectionState.Closed)
            {
                sqlCon.Open();
            }
            SqlCommand sqlCmd = new SqlCommand();
            sqlCmd.Connection = sqlCon;
            sqlCmd.CommandText = "Select * from tb_admin Where username='" + txtName.Text.Trim() + "'";
            sqlDa = sqlCmd.ExecuteReader();
            if (Session["UserName"] == null || Session["UserName"].ToString() == "")
            {
                if (sqlDa.HasRows)
                {
                    while (sqlDa.Read())
                    {
                        if (txtPwd.Text.Trim() == sqlDa["password"].ToString().Trim() && txtCode.Text.ToLower() == Session["CheckCode"].ToString())