/// <summary>
 /// Search sử dụng session
 /// </summary>
 private void search_using_session()
 {
     try
     {
         m_ds_giang_vien.Clear();
         m_us_dm_giang_vien.search_giang_vien(CIPConvert.ToStr(Session["Sname"])
                                              , CIPConvert.ToStr(Session["Skey"])
                                              , CIPConvert.ToStr(Session["Sgender"])
                                              , CIPConvert.ToDecimal(Session["Sstatus"])
                                              , CIPConvert.ToDecimal(Session["Squanly"])
                                              , m_ds_giang_vien
                                              , CIPConvert.ToDecimal(Session["Sthanghoptac"])
                                              , CIPConvert.ToDecimal(Session["Snamhoptac"])
                                              , CIPConvert.ToDecimal(Session["Smonth"])
                                              , CIPConvert.ToStr(Session["Sgvcm"])
                                              , CIPConvert.ToStr(Session["Sgvhd"])
                                              , CIPConvert.ToStr(Session["Sviethl"])
                                              , CIPConvert.ToStr(Session["Sduyethl"])
                                              , CIPConvert.ToStr(Session["Sthamdinhhl"])
                                              , CIPConvert.ToStr(Session["Squayhl"])
                                              , CIPConvert.ToStr(Session["Shdkh"])
                                              , CIPConvert.ToStr(Session["Spochinh"])
                                              , CIPConvert.ToStr(Session["Spophu"])
                                              , CIPConvert.ToStr(Session["Strangthaitt"])
                                              , CIPConvert.ToStr(Session["Username"]));
         m_lbl_ket_qua_loc_du_lieu.Text = "Kết quả lọc dữ liệu: " + m_ds_giang_vien.V_DM_GIANG_VIEN.Rows.Count + " bản ghi";
         if (m_ds_giang_vien.V_DM_GIANG_VIEN.Rows.Count == 0)
         {
             m_lbl_thong_bao.Text = "Không có bản ghi nào phù hợp";
             m_grv_dm_danh_sach_giang_vien.DataSource = m_ds_giang_vien.V_DM_GIANG_VIEN;
             m_grv_dm_danh_sach_giang_vien.DataBind();
             if (m_grv_dm_danh_sach_giang_vien.Visible == true)
             {
                 m_grv_dm_danh_sach_giang_vien.Visible = false;
             }
             return;
         }
         m_grv_dm_danh_sach_giang_vien.Visible    = true;
         m_grv_dm_danh_sach_giang_vien.DataSource = m_ds_giang_vien.V_DM_GIANG_VIEN;
         m_grv_dm_danh_sach_giang_vien.DataBind();
     }
     catch (Exception ve)
     {
         throw ve;
     }
 }