protected void submit_Click(object sender, EventArgs e)
 {
     string userName = Tools.safeUserInput(username.Text.Trim());
     string passWord = Tools.safeUserInput(password.Text.Trim());
     if (userName.Length < 1) { MessageBox.Show(this, "用户名不能为空"); return; }
     if (passWord.Length < 1) { MessageBox.Show(this, "密码不能为空"); return; }
     administratorBLL adminbll = new administratorBLL();
     string loginMessage = adminbll.Login(userName, passWord);
     if (loginMessage.Equals("1"))
     {
         string stuIdStr = adminbll.GetModel(userName).id.ToString();
         Session["status"] = "true";
         Session["UserId"] = stuIdStr;
         Session["type"] = "1";
         MessageBox.ShowAndRedirect(this, "登录成功!", "student.aspx");
     }
     else
     {
         if (loginMessage.Equals("2"))
         {
             string stuIdStr = adminbll.GetModel(userName).id.ToString();
             Session["status"] = "true";
             Session["UserId"] = stuIdStr;
             Session["type"] = "2";
             MessageBox.ShowAndRedirect(this, "登录成功!", "student.aspx");
         }
         else
         {
             Session["status"] = "false";
             Session["UserId"] = "0";
             Session["type"] = "0";
             MessageBox.ShowAndRedirect(this, loginMessage, "logout.aspx");
         }
     }
 }