添加用户

protected void BtnSave_Click(object sender, EventArgs e)
        {
            try
            {
                bm_user_info.USER_ADD = "n";
                bm_user_info.USER_EXAMINE ="n";
                bm_user_info.USER_NAME = TxtUid.Text;
                bm_user_info.TRUE_NAME = TxtName.Text;
                bm_user_info.USER_PASSWORD = TxtPwd.Text;
                bm_user_info.LOGIN_TIME = DateTime.Now.ToShortDateString();
                bm_user_info.USER_STATE = "";
                bm_user_info.USER_DETIAL = "";
                bm_user_info.USER_OTHER = "";
                List<BM_USER_INFO> lists = bm_user_infoManager.GetModelList("USER_NAME='" + bm_user_info.USER_NAME + "'");
                if (lists.Count > 0)
                {
                    Response.Write("<script>alert('用户名已存在!')</script>");
                }
                else
                {
                    bm_user_infoManager.Add(bm_user_info);
                    Response.Write("<script>alert('添加成功')</script>");
                }
            }
            catch(Exception ex)
            {
                Response.Write("<script>alert('错误原因：" + ex.Message + "')</script>");
            }
        }


求解为什么添加了后，数据库中没反应