public void btnNext_Click(object sender, EventArgs e)
    {
        ParkingBusiness pb = new ParkingBusiness();
        pl.ListOfSpots = new List<ParkingSpot>();
        ParkingSpot ps = new ParkingSpot();
        int validNameResult = 0;

        if (TextBoxNameOfNewParking.Text.Equals("") || TextBoxLocationOfNewParking.Text.Equals("") || TextBoxDimensionsOfParkingX.Text.Equals("") || TextBoxDimensionsOfParkingY.Text.Equals(""))
        {
            LabelError.Text = "Espacios vacíos";
        }
        else
        {
            pl.Name = TextBoxNameOfNewParking.Text;
            pl.Location = TextBoxLocationOfNewParking.Text;
            pl.DimensionX = Int32.Parse(TextBoxDimensionsOfParkingX.Text);
            pl.DimensionY = Int32.Parse(TextBoxDimensionsOfParkingY.Text);
            Session["PARKINGLOT"] = pl;
            validNameResult = pb.VerifyParking(pl);
            if (validNameResult == -1)
            {
                LabelError.Text = "Nombre del parqueo ya existe";
                TextBoxNormalSpot.Enabled = true;
                TextBoxNameOfNewParking.Enabled = true;
                TextBoxLocationOfNewParking.Enabled = true;
                TextBoxDimensionsOfParkingX.Enabled = true;
                TextBoxDimensionsOfParkingY.Enabled = true;
            }
            else
            {
                ButtonNext.Enabled = false;
                ButtonCancel.Enabled = false;
                TextBoxNormalSpot.Text = "" + pl.DimensionX * pl.DimensionY;
                Session["AddParking"] = 1;
            }
        }
    }