protected void btnSaveGhiChu_Click(object sender, EventArgs e)
 {
     if (Request.QueryString["IDCaSau"] != null)
     {
         csCont.CaSau_UpdateGhiChu(int.Parse(Request.QueryString["IDCaSau"]), Server.HtmlDecode(txtGhiChu.Text.Trim()));
     }
 }