bazar.Accrual.RenderSumColumn C# (CSharp) Method

        private void RenderSumColumn(Gtk.TreeViewColumn column, Gtk.CellRenderer cell, Gtk.TreeModel model, Gtk.TreeIter iter)
        {
            decimal Sum = (decimal) model.GetValue (iter, (int)ServiceCol.sum);
            decimal Paid ;
            if(model.GetValue (iter, (int)ServiceCol.paid) != null)
                Paid = (decimal) model.GetValue (iter, (int)ServiceCol.paid);
            else
                Paid = 0;
            decimal Debt = Sum - Paid;
            if (Debt <= 0 && Sum != 0)
            {
                (cell as Gtk.CellRendererText).Foreground = "darkgreen";
            }
            else
            {
                (cell as Gtk.CellRendererText).Foreground = "black";
            }
            (cell as Gtk.CellRendererText).Text = String.Format("{0:0.00}", Sum);
        }