Hi Rene
Thanks for using Syncfusion products.
We suggest you to use node “AddInfo” property to achieve your requirement. Please refer the code snippet and sample below.
Code snippet:
Node node = new Node();
Dictionary<string, object> addinfo = new Dictionary<string, object>();
addinfo.Add("description", "diagram");
addinfo.Add("businessunit", "sam");
addinfo.Add("leader","king");
node.AddInfo = addinfo;
Diagram1.Nodes.Add(node);
Sample:http://www.syncfusion.com/downloads/support/directtrac/118331/WebApplication22004851548.zip
Please refer the below knowledge base link which represents how to add custom properties to nodes and connectors.
Knowledgebase:http://www.syncfusion.com/kb/3051/how-to-add-custom-properties-to-nodes-and-connectors
Please let me know if any concerns.
Regards,
Shyam G