private void dgvAssets_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            var type       = dgvAssets.CurrentRow.Cells["Type"].Value.ToString();
            var assetIdstr = dgvAssets.CurrentRow.Cells["ID"].Value.ToString();

            if (type.Equals("Động Sản"))
            {
                frmPersonalty personalty = new frmPersonalty();
                personalty.ContractId = ContractId;
                personalty.AssetId    = int.Parse(assetIdstr);
                DialogResult dr = personalty.ShowDialog();
                if (dr == DialogResult.OK)
                {
                    //bind data to dgvAssets
                    BindDataAssetList();
                }
            }
            if (type.Equals("Bất Động Sản"))
            {
                frmRealEstate realEstate = new frmRealEstate();
                realEstate.ContractId = ContractId;
                realEstate.AssetId    = int.Parse(assetIdstr);
                DialogResult dr = realEstate.ShowDialog();
                if (dr == DialogResult.OK)
                {
                    //bind data to dgvAssets
                    BindDataAssetList();
                }
            }
        }
        private void btnThemBatDongSan_Click(object sender, EventArgs e)
        {
            try
            {
                bool isCreate = false;

                if (ContractId.HasValue)
                {
                    isCreate = CreateContract();
                }
                else
                {
                    if (MessageBox.Show("Thông tin sẽ được lưu lại. Bạn có tiếp tục?", "Thông báo", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                    {
                        isCreate = CreateContract();
                    }
                }

                if (isCreate)
                {
                    frmRealEstate realEstate = new frmRealEstate();
                    realEstate.ContractId = ContractId;
                    DialogResult dr = realEstate.ShowDialog();
                    if (dr == DialogResult.OK)
                    {
                        //bind data to dgvAssets
                        BindDataAssetList();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Lỗi", MessageBoxButtons.OK);
            }
        }