I have this:

private void BtnCheckClick(object sender, EventArgs e)
{
        var a = txtLot.Text;
        var b = cmbMcu.SelectedItem.ToString();
        var c = cmbLocn.SelectedItem.ToString();
        btnCheck.BackColor = Color.Red;
        var task = Task.Factory.StartNew(() => 
                           Dal.GetLotAvailabilityF41021(a, b, c));
        task.ContinueWith(t =>
        {
                btnCheck.BackColor = Color.Transparent;
                lblDescriptionValue.Text = t.Result.Description;
                lblItemCodeValue.Text = t.Result.Code;
                lblQuantityValue.Text = t.Result.AvailableQuantity.ToString();
        },TaskScheduler .FromCurrentSynchronizationContext() );
        LotFocus(true);
}

and i followed J. Skeet's advice to move into async,await in my .NET 4.0 app. I converted into this:

private async void BtnCheckClick(object sender, EventArgs e)
{
        var a = txtLot.Text;
        var b = cmbMcu.SelectedItem.ToString();
        var c = cmbLocn.SelectedItem.ToString();
        btnCheck.BackColor = Color.Red;
        JDEItemLotAvailability itm = await Task.Factory.StartNew(() => Dal.GetLotAvailabilityF41021(a, b, c));
        btnCheck.BackColor = Color.Transparent;
        lblDescriptionValue.Text = itm.Description;
        lblItemCodeValue.Text = itm.Code;
        lblQuantityValue.Text = itm.AvailableQuantity.ToString();
        LotFocus(true);
}

It works fine. What confuses me is that i could do it without using Task but just the method of my Dal. But that means that i must have modified my Dal method, which is something i dont want?

I would appreciate if someone would explain to me in "plain" words if what i did is optimal or not and why.

Thanks

P.s. My dal method

public bool CheckLotExistF41021(string _lot, string _mcu, string _locn)
{
        using (OleDbConnection con = new OleDbConnection(this.conString))
        {
                OleDbCommand cmd = new OleDbCommand();
                cmd.CommandText = "select lilotn from proddta.f41021 " +
                                        "where lilotn = ? and trim(limcu) = ? and lilocn= ?";
                cmd.Parameters.AddWithValue("@lotn", _lot);
                cmd.Parameters.AddWithValue("@mcu", _mcu);
                cmd.Parameters.AddWithValue("@locn", _locn);
                cmd.Connection = con;
                con.Open();
                OleDbDataReader rdr = cmd.ExecuteReader();
                bool _retval = rdr.HasRows;
                rdr.Close();
                con.Close();
                return _retval;
        }
}