public string IsExits(string user_name)
        {
            string        result = "";
            YouthUsersBLL bll    = new YouthUsersBLL();
            bool          i      = bll.IsExits(user_name);

            if (i)
            {
                result = "用户名已存在,请重新添加";
            }
            else
            {
                result = "";
            }
            return(result);
        }
        protected void lbtnAdd_Click(object sender, EventArgs e)
        {
            //确保添加用户的唯一性
            YouthUsersBLL bll       = new YouthUsersBLL();
            string        user_name = txt_userName.Text.ToString();
            bool          i         = bll.IsExits(user_name);

            if (i)
            {
                Response.Write("<script>alert('用户名已存在,请重新输入')</script>");
                return;
            }

            else
            {
                YouthInitialPwdBLL ip_bll = new YouthInitialPwdBLL();
                user_model.User_name        = txt_userName.Text.ToString();
                user_model.User_pwd         = MyUtil.MD5(ip_bll.GetInitialPwd());
                user_model.Role_id          = Convert.ToInt32(ddl_role.SelectedValue.ToString());
                user_model.True_name        = txt_trueName.Text.ToString();
                user_model.User_sex         = ddl_sex.SelectedItem.Text;
                user_model.User_dep         = Convert.ToInt32(ddl_dep.SelectedValue.ToString());
                user_model.User_academic_id = Convert.ToInt32(ddl_academic.SelectedValue.ToString());
                if (ddl_status.SelectedItem.Text.Trim().Equals("正常"))
                {
                    user_model.User_status = "Y";
                }
                else
                {
                    user_model.User_status = "N";
                }
                user_model.User_phone   = txt_phone.Text;
                user_model.User_email   = txt_email.Text;
                user_model.User_points  = Convert.ToInt32(txt_points.Text.ToString());
                user_model.User_address = txt_address.Text;
                if (user_bll.AddUsers(user_model))
                {
                    //添加成功
                    MyUtil.ShowMessageRedirect(this.Page, "添加成功", "youth_UserList.aspx");
                }
                else
                {
                    //添加失败,清空
                    MyUtil.ShowMessage(this.Page, "添加失败");
                }
            }
        }