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 Login : System.Web.UI.Page
{
    SqlHelper data = new SqlHelper();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (Session["username"] == null)
            {
                TABLE2.Visible = false;
                TABLE1.Visible = true;
              
            }
            else
            {
                TABLE2.Visible = true;
                TABLE1.Visible = false;
             
                Label1.Text = Session["User_realName"].ToString();

            }
        }
    }
    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        Session.Abandon();
        Session.Clear();
        Session["username"] = null;
        Session["User_realName"] = null;
        Alert.AlertAndRedirect("退出成功", "Default.aspx");
    }
   
    protected void LinkButton3_Click(object sender, EventArgs e)
    {
        Response.Redirect("Mpwd.aspx");

    }
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
  string sql = "select * from users where [user_name]='" + txname.Value + "' and user_pwd='" + txtpwd.Value + "' ";
        SqlDataReader dr = data.GetDataReader(sql);
        if (dr.Read())
        {
            Session["username"] = dr["user_name"].ToString();
            Session["id"] = dr["user_Id"].ToString();
            Session["User_realName"] = dr["User_realName"].ToString();
            Alert.AlertAndRedirect("登录成功", "Default.aspx");
        }
        else