Admin/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 Admin_Login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        if (Session["VaildCode"].ToString().ToLower() == this.TextBox3.Text.ToLower())
        {
            SqlConnection con = new SqlConnection(SqlHelper.connstring);
            con.Open();
            string roleName = ddlRole.Text.Trim();
            string sql = "";
            if (roleName == "管理员")
            {
                sql = "select  * from Admin where Aname='" + txtname.Value + "' and Apwd='" + txtpwd.Value + "'";
                SqlCommand cmd = new SqlCommand(sql, con);
                SqlDataReader sdr = cmd.ExecuteReader();
                if (sdr.Read())
                {
                    Session["Admin"] = sdr["Aname"].ToString();
                    Session["AdminId"] = sdr["id"].ToString();
                    Response.Write("<script language='javascript'>alert('登录成功');location.href='index.html'</script>");
                }
                else
                {
                    Response.Write("<script language='javascript'>alert('用户名或密码错误请重新登录');location.href='login.aspx'</script>");
                }
            }
            else
            {
                sql = "select * from Users where UserName='" + txtname.Value + "' and pwd='" + txtpwd.Value + "' and UserType='教师'";
                SqlCommand cmd = new SqlCommand(sql, con);
                SqlDataReader sdr = cmd.ExecuteReader();
                if (sdr.Read())
                {
                    Session["TeacherName"] = sdr["UserName"].ToString();
                    Session["TeacherId"] = sdr["id"].ToString();
                    Response.Write("<script language='javascript'>alert('登录成功');location.href='../Teachter/index.html'</script>");
                }
                else
                {
                    Response.Write("<script language='javascript'>alert('用户名或密码错误请重新登录');location.href='login.aspx'</script>");
                }
            }
        }
        else