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
{
    SqlDataReader dr;
    SqlHelper data = new SqlHelper();
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Image1_ServerClick(object sender, ImageClickEventArgs e)
    {
        if (Text1.Value == "" && Password1.Value == "")
        {
            Alert.AlertAndRedirect("没有输入账号和密码！", "Login.aspx");


        }
        else
        {
            if (DropDownList1.SelectedValue == "管理员")
            {
                dr = data.GetDataReader("select * from  Admin where Admin='" + Text1.Value + "'and Pwd='" + Password1.Value + "'");
                if (dr.Read())
                {
                    Session["adminid"] = dr["id"].ToString();
                    Session["admin"] = dr["Admin"].ToString();
                    Response.Redirect("admin/Default.aspx");

                }
                else
                {
                    Alert.AlertAndRedirect("账号或者密码不对请重新登陆！", "Login.aspx");
                }
            }
            else if (DropDownList1.SelectedValue == "教师")
            {
                dr = data.GetDataReader("select * from  Teachter where Name='" + Text1.Value + "'and Pwd='" + Password1.Value + "'");
                if (dr.Read())
                {
                    Session["adminid"] = dr["id"].ToString();
                    Session["admin"] = dr["Name"].ToString();
                    Session["BanJIId"] = dr["ClassInfoId"].ToString();
                    Response.Redirect("Default.aspx");

                }
                else
                {
                    Alert.AlertAndRedirect("账号或者密码不对请重新登陆！", "Login.aspx");
                }
            }