Faster way to fill DataGridView

DataTable dataIN = new DataTable();
        public winContracteActive()
        {
            InitializeComponent();
            incarcaProduse();
        }

        private void winContracteActive_Load(object sender, EventArgs e)
        {

        }
        private void incarcaProduse()
        {
            try
            {
                AsyncProcessDelegate d = delegate()
                {
                    dataIN = InterogariDB.incarcaProduse();
                    this.Invoke((MethodInvoker)delegate
                    {
                        citireDate("contracteActive");
                    });
                };
                RunAsyncOperation(d);
            }
            catch (Exception Ex)
            {
                string msg = "Cod eroare: 001. \n\nEroare: \n" + Ex.Message;
                DoHandleException(msg);
            }
        }
        private void citireDate(string tipInterogare)
        {
            try
            {
                AsyncProcessDelegate d = delegate()
                {
                    ContractItem[] produseContract = InterogariDB.filtrareProduse(dataIN, tipInterogare);
                    this.Invoke((MethodInvoker)delegate
                    {
                        dContracte.DefaultCellStyle.WrapMode = DataGridViewTriState.True;
                        dContracte.SuspendLayout();
                        try
                        {
                            dContracte.DataSource = produseContract;
                        }
                        finally
                        {
                            dContracte.ResumeLayout();
                        }
                    });
                };
                RunAsyncOperation(d);
            }
            catch (Exception Ex)
            {
                string msg = "Cod eroare: 001. \n\nEroare: \n" + Ex.Message;
                DoHandleException(msg);
            }
        }

internal static DataTable incarcaProduse()
        {
            Program.Connection.CommandText = "select ContractItems.ContractItemId, ContractItems.ContractId, ContractItems.Name, ContractItems.Description, ContractItems.Payment, ContractItems.Quantity, "
            + "ContractItems.QuantityUnit, IIF(ContractItems.DeletedId Is Null, 0, ContractItems.DeletedId) AS idStergere, IIF(ContractItems.GramajBrut Is Null, 0, ContractItems.GramajBrut) AS GramajBrut, " +
            " IIF(ContractItems.CategorieProdus Is Null, 0, ContractItems.CategorieProdus) AS CategorieProdus"
            + ", Contracts.CreateDate, Contracts.StartDate, Contracts.EndDate FROM Contracts INNER JOIN ContractItems ON Contracts.ContractId = ContractItems.ContractId";
            DataTable dataTI = new DataTable();
            Program.Connection.FillDataTable(dataTI, true);
            return dataTI;
        }
        internal static ContractItem[] filtrareProduse(DataTable dataIN, string tipInterogare)
        {
            DataTable dataFI = new DataTable();
            switch (tipInterogare)
            {
                case "contracteActive":
                    dataFI = dataIN.AsEnumerable()
                          .Where(i => i.Field<int>("idStergere") == 0)
                          .OrderBy(i => i.Field<int>("ContractId"))
                          .CopyToDataTable();
                    break;

                case "toateContractele":
                    dataFI = dataIN.AsEnumerable()
                          .Where(i => i.Field<int>("idStergere") != 0)
                          .OrderBy(i => i.Field<int>("ContractId"))
                          .CopyToDataTable();
                    break;

            }



            if (dataFI.Rows.Count == 0)
            {
                throw new Exception(string.Format("Nu sunt contracte in baza de date."));
            }
            return Lista<ContractItem>(dataFI, delegate(DataRow rezultatTB)
            {
                return new ContractItem(rezultatTB);
            });
        }