Admin/Login.aspx.cs

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using System;
using System.Collections.Generic;

using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

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

    }
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        //判断用户输入是否完整
        if (TextBox2.Text.ToString().Trim() == "" || TextBox1.Text.ToString().Trim() == "")
        {
            Response.Write("<script>javascript:alert('请输入完整');history.back();</script>");
            Response.End();
        }
        else
        {//传值给新定义的变量
            string membername = this.TextBox1.Text.Trim();
            string pwd = TextBox2.Text;
            if (this.DropDownList1.SelectedIndex == 0)
            {//当用户选择的是管理员的时候，去管理员表查询并登录

                string sql1 = "select * from TB_Admin where UserName='{0}' and Password='{1}'";
                string sql2 = string.Format(sql1, membername, pwd);
                DataTable dt = DBHelper.GetDataSet(sql2).Tables[0];
                if (dt.Rows.Count > 0)
                {
                    Session["username"] = this.TextBox1.Text; Session["cx"] = "管理员";
                    Response.Redirect("manage.aspx");
                }
                else
                {
                    Response.Write("<script>javascript:alert('对不起，用户名或密码不正确!');</script>");
                }
            }

            else if (this.DropDownList1.SelectedIndex == 1)
            {//当用户选择的是店长的时候，去店长表查询并登录

                string sql1 = "select * from TB_SysUser where UserName='{0}' and Password='{1}' and Role='店长'";
                string sql2 = string.Format(sql1, membername, pwd);
                DataTable dt = DBHelper.GetDataSet(sql2).Tables[0];
                if (dt.Rows.Count > 0)
                {
                    Session["username"] = this.TextBox1.Text; Session["cx"] = "店长";
                    Response.Redirect("manage.aspx");
                }
                else
                {
                    Response.Write("<script>javascript:alert('对不起，用户名或密码不正确!');</script>");
                }
            }
            else