StonehearthEditor.EncounterDesignerView.graphViewer_EdgeAdded C# (CSharp) Method

        private void graphViewer_EdgeAdded(object sender, EventArgs e)
        {
            Edge edge = (Edge)sender;
            if (!GameMasterDataManager.GetInstance().TryAddEdge(edge.Source, edge.Target))
            {
                // Shouldn't add this edge. Undo it
                graphViewer.Undo();
            }
            else
            {
                GameMasterDataManager.GetInstance().SaveModifiedFiles();
                if (refreshGraphTimer == null)
                {
                    refreshGraphTimer = new Timer();
                    refreshGraphTimer.Interval = 100;
                    refreshGraphTimer.Enabled = true;
                    refreshGraphTimer.Tick += new EventHandler(OnRefreshTimerTick);
                    refreshGraphTimer.Start();
                }
            }
        }