private void BtImpDeletePro_Click(object sender, EventArgs e)
        {
            List <DetailImport> List = new List <DetailImport>();
            var IdBill = DgvImp.CurrentRow.Cells["ID"].Value.ToString();
            int Bill   = Convert.ToInt16(IdBill);

            for (int i = 0; i < DgvImpPro.RowCount; i++)
            {
                DetailImport ImpPro = new DetailImport();
                var          str    = DgvImpPro.Rows[i].Cells["ID"].Value.ToString();
                ImpPro.IDProduct = Convert.ToInt16(str);
                ImpPro.IDBill    = Bill;
                var quan = DgvImpPro.Rows[i].Cells["Quantity"].Value.ToString();
                ImpPro.Quantity = Convert.ToInt16(quan);
                List.Add(ImpPro);
            }
            var IdPro  = DgvImpPro.CurrentRow.Cells["ID"].Value.ToString();
            int Pro    = Convert.ToInt16(IdPro);
            var ProImp = List.Where(p => p.IDProduct == Pro).SingleOrDefault();

            List.Remove(ProImp);
            LoadPro(List);
            TxtImpProCode.Clear();
            TxtImpProName.Clear();
            TxtImpProUnit.Clear();
            TxtImpProQuan.Clear();
        }
        private void BtImpFresh_Click(object sender, EventArgs e)
        {
            TxtImpDeliver.Clear();
            TxtImpProCode.Clear();
            TxtImpProName.Clear();
            TxtImpProQuan.Clear();
            TxtImpProUnit.Clear();
            var result = db.Storekeepers.Find(Medium.IdSto);

            TxtImpStoID.Text       = result.ID.ToString();
            TxtImpStorekeeper.Text = result.Name;
            DgvImpPro.DataSource   = null;
        }