private void dtgv_XeGui_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            frmChinhSuaDanhSachXeGui frmChinhSua = new frmChinhSuaDanhSachXeGui();

            frmChinhSua.txb_MaVe.Text   = dtgv_XeGui.CurrentRow.Cells[0].Value.ToString();
            frmChinhSua.txb_BienSo.Text = dtgv_XeGui.CurrentRow.Cells[1].Value.ToString();
            if (dtgv_XeGui.CurrentRow.Cells[2].Value.ToString() == "Xe dap")
            {
                frmChinhSua.cb_LoaiXe.SelectedIndex = 0;
            }
            else if (dtgv_XeGui.CurrentRow.Cells[2].Value.ToString() == "Xe may")
            {
                frmChinhSua.cb_LoaiXe.SelectedIndex = 1;
            }
            else
            {
                frmChinhSua.cb_LoaiXe.SelectedIndex = 2;
            }
            frmChinhSua.txb_HieuXe.Text = dtgv_XeGui.CurrentRow.Cells[3].Value.ToString();
            byte[] pic;
            pic = (byte[])dtgv_XeGui.CurrentRow.Cells[4].Value;
            MemoryStream picture = new MemoryStream(pic);

            frmChinhSua.ptb_HinhAnh.Image    = Image.FromStream(picture);
            frmChinhSua.dtp_GioVaoBen.Value  = Convert.ToDateTime(dtgv_XeGui.CurrentRow.Cells[5].Value.ToString());
            frmChinhSua.dtp_NgayVaoBen.Value = (DateTime)dtgv_XeGui.CurrentRow.Cells[6].Value;
            if (dtgv_XeGui.CurrentRow.Cells[7].Value.ToString() == "Ve gio")
            {
                frmChinhSua.cb_LoaiVe.SelectedIndex = 0;
            }
            else if (dtgv_XeGui.CurrentRow.Cells[7].Value.ToString() == "Ve ngay")
            {
                frmChinhSua.cb_LoaiVe.SelectedIndex = 1;
            }
            else if (dtgv_XeGui.CurrentRow.Cells[7].Value.ToString() == "Ve tuan")
            {
                frmChinhSua.cb_LoaiVe.SelectedIndex = 2;
            }
            else
            {
                frmChinhSua.cb_LoaiVe.SelectedIndex = 3;
            }
            frmChinhSua.ShowDialog(this);
        }
        private void btn_Sua_Click(object sender, EventArgs e)
        {
            frmChinhSuaDanhSachXeGui frmChinhSua = new frmChinhSuaDanhSachXeGui();

            frmChinhSua.ShowDialog(this);
        }