How to recognize node or links in selected parts

GoXam
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GOXAM : how to recognize whether its a node or a link in selected parts of diagram

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Could you provide a specific context in which you would want to know?

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mydiagram.SelectedParts property is returning both the nodes and links selected (by ctrl+a / by mouse)
I want to update the properties of only nodes but in selected parts links are also appended to its giving me unable to cast… error

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  foreach (var p in myDiagram.SelectedParts) {
    if (p is Node) ...
  }