Login.aspx.cs

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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;
public partial class Login : System.Web.UI.Page
{
    SqlHelper data = new SqlHelper();
    SqlDataReader dr;
    Alert js = new Alert();
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        if (TxtUserName.Text == "" && TxtPassword.Text == "")
        {
            Alert.AlertAndRedirect("没有输入账号和密码！", "Login.aspx");
        }
        else
        {
            string url = "";
            if (this.DropDownList1.Text == "管理员")
            {
                url = "Admin/index.htm";
                dr = data.GetDataReader("select * from  admin where username='" + TxtUserName.Text.Trim() + "'and mima='" + TxtPassword.Text.Trim() + "' and cx='管理员'");
          
            }
            else if (this.DropDownList1.Text == "督导")
            {
                url = "dudao/index.htm";
                dr = data.GetDataReader("select * from  admin where username='" + TxtUserName.Text.Trim() + "'and mima='" + TxtPassword.Text.Trim() + "' and cx='督导'"); ;
            }
            else if (this.DropDownList1.Text == "教师")
            {
                url = "jiaoshi/index.htm";
                dr = data.GetDataReader("select * from  jiaoshi where yonghuming='" + TxtUserName.Text.Trim() + "'and  mima='" + TxtPassword.Text.Trim() + "'"); ;
            }
            else 
            {
                url = "xuesheng/index.htm";
                dr = data.GetDataReader("select * from  xuesheng where xuehao='" + TxtUserName.Text.Trim() + "'and mima='" + TxtPassword.Text.Trim() + "'");
     
            }
            if (dr.Read())
            {
                Session["ID"] = dr["ID"].ToString();
                Session["mima"] = dr["mima"].ToString();
                if (this.DropDownList1.Text == "管理员" || this.DropDownList1.Text == "督导")
                {
                    Session["admin"] = dr["username"].ToString();
                }
                else 
                {
                    Session["admin"] = dr["xingming"].ToString();
                    Session["zhuanyeID"] = dr["zhuanyeID"].ToString();
                }