When I try to load 15,000 nodes with 15,000 links it is giving stack overflow exception 
Same code is working for other projects with 2000 links and nodes
Is there any limit ?
If yes, how many?
If no, could someone please give me the solution …………

private void RecurseActivity(CustomShapeNode currentNetworkGraphNode)
       {
           //Recurse all children
           foreach (MpLink lnkPre in ((MpActivity)currentNetworkGraphNode.Tag).ToConstraints)
           {
               CustomShapeNode predecessorNetworkGraphNode = null;

               //Only create the node if the node is not already created
               if (!CreatedNodes.ContainsKey(lnkPre.FromMpActivity) || CreatedNodes[lnkPre.FromMpActivity] == null)
               {
                   predecessorNetworkGraphNode = CreateShapeNode(lnkPre.FromMpActivity, NodeType.child, false);
                   CreatedNodes.Add(lnkPre.FromMpActivity, predecessorNetworkGraphNode);
               }
               else
               {
                   foreach (DiagramNode n in NetworkDiagram.Nodes)
                   {
                       if (((CustomShapeNode)n).Tag == lnkPre.FromMpActivity)
                       {
                           predecessorNetworkGraphNode = (CustomShapeNode)n;
                           break;
                       }
                   }
               }
               //Add a relation between the new child and the currentnode (only happens if no relation exist)
               if (CreateLink(predecessorNetworkGraphNode, currentNetworkGraphNode, lnkPre))
                   RecurseActivity(predecessorNetworkGraphNode);
           }

           //recurse all parents
           foreach (MpLink lnkSuc in ((MpActivity)currentNetworkGraphNode.Tag).FromConstraints)
           {
               //create the parentnode
               CustomShapeNode successorNetworkGraphNode = null;

               if (!CreatedNodes.ContainsKey(lnkSuc.ToMpActivity) || CreatedNodes[lnkSuc.ToMpActivity] == null)
               {
                   successorNetworkGraphNode = CreateShapeNode(lnkSuc.ToMpActivity, NodeType.parent, false);
                   CreatedNodes.Add(lnkSuc.ToMpActivity, successorNetworkGraphNode);
               }
               else
               {
                   foreach (DiagramNode n in NetworkDiagram.Nodes)
                   {
                       if (((CustomShapeNode)n).Tag == lnkSuc.ToMpActivity)
                       {
                           successorNetworkGraphNode = (CustomShapeNode)n;
                           break;
                       }
                   }
               }
               //add the relation between the current node and the new parent (only happens if no relation exist)
               if (CreateLink(currentNetworkGraphNode, successorNetworkGraphNode, lnkSuc))
                   RecurseActivity(successorNetworkGraphNode);
           }
       }

Thanks for your replay!!!!!!!

So, you mean there is no maximum limit for nodes and links in flowchart diagram, right?

Hi Stoyo,
I tried with stack mechanismus, now there is no problem while adding the nodes to diagram.
But, I am getting the same error while arranging in flowchart diagram I tried with all layouts it is not working .
Same thing is working for around 7000 nodes and links to arrange in layouts

Oky,
Could you please tell me how to catch that exception
I used the try catch block it is not working
Thanks in advance !!!

We've tried to reproduce this on a graph with 20K nodes but couldn't. Could you post here the layout settings you are using, and if possible email us a sample graph of yours saved as xml?

Thanks,
Stoyan