//NumPerPage -- so dong tren 1 trang
        public void InitPager(int NumPerPage)
        {
            DataTable dt = (DataTable)gridControl.DataSource;
            PagerInfo page = new PagerInfo();
            page.Data = dt;
            page.NumPerPage = NumPerPage; //Data la DataTable

            int totalRow = dt.Rows.Count;
            if (totalRow % NumPerPage == 0)
            {
                page.TotalPage = totalRow / NumPerPage;
            }
            else
            {
                page.TotalPage = totalRow / NumPerPage + 1;
            }
            if (dt.Rows.Count == 0)
            {
                this.Visible = false;
                return;
            }
            else
            {
                this.Visible = true;
                page.CurrentPage = 1;
            }
            lblTongSoDong.Text = totalRow.ToString();
            object temp = this.gridControl.Tag;
            TagPropertyMan.InsertOrUpdate(ref temp, PagerInfo.PAGE_INFO, page);
            this.gridControl.Tag = temp;

            ShowCurrentPage(page);
        }
        private void ShowCurrentPage(PagerInfo page)
        {
            DataTable tempt = page.GetCurrentPage();
            gridControl.DataSource = tempt;
            //New update for get detail of Ung Vien
            if (DetailOfFirtsRows != null)
                DetailOfFirtsRows(HelpNumber.ParseInt64(tempt.Rows[0]["ID"]));
            //--------------------
            //gridView.FocusedRowHandle = 0;
            textEdit1.Properties.Appearance.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Center;
            textEdit1.Text = page.CurrentPage + "/" + page.TotalPage ;
            textEdit1.Properties.AllowFocused = false;
            textEdit1.BackColor = Color.White;
            textEdit1.Update();
            if (page.CurrentPage == page.TotalPage)
            {
                btnLast.Enabled = false;
                btnNextPage.Enabled = false;
            }
            else
            {
                btnLast.Enabled = true;
                btnNextPage.Enabled = true;
            }

            if (page.CurrentPage == 1)
            {
                btnFirst.Enabled = false;
                btnPrevPage.Enabled = false;
            }
            else
            {
                btnFirst.Enabled = true;
                btnPrevPage.Enabled = true;
            }
        }