private void TileLapTheDocGia_Click(object sender, EventArgs e)
{
lblTitel_Click(sender, e);
GridViewDSTheDocGia.Visible = true;
GridViewDSTheDocGia.Location = new Point(250, 137);
GridViewDSTheDocGia.Size = new Size(889, 333);
btnDatPhieu.Visible = true;
btnDatPhieu.Location = new Point(1155, 432);
btnSuaPhieu.Visible = true;
btnSuaPhieu.Location = new Point(1155, 387);
btnXoaPhieu.Visible = true;
btnXoaPhieu.Location = new Point(1155, 342);
btnEXLapThe.Visible = true;
btnEXLapThe.Location = new Point(1155, 297);
btnReportTheDocGia.Visible = true;
btnReportTheDocGia.Location = new Point(1155, 259);
lblTieuTeTabQL.Visible = true;
lblTieuTeTabQL.Text = "Danh Sách Các Thẻ Độc Giả";
Class.XuLyThuVien KiemTra = new Class.XuLyThuVien();
GridViewDSTheDocGia.DataSource = KiemTra.DataViewTheDocGia();
}