Hi,

You can access node's links via the OutgoingLinks and IncomingLinks collections. If the nodes are tables with ConnectionStyle set to Rows, links will be in the respective Row object collections instead in the node's ones, or you could use GetAllIncomingLinks and GetAllOutgoingLinks methods to get links for all rows. If you don't care about link directions, you could call node.GetAllLinks() to get a list of both in- and out- links.

Here's some sample code showing a couple of ways to access neighbor nodes - via the link collections or the Query method:

private void diagram_NodeClicked(object sender, NodeEventArgs e)
{
	if (e.MouseButton == MouseButton.Left)
	{
		foreach (var link in e.Node.OutgoingLinks)
			link.Destination.Brush = new SolidBrush(Color.LightGreen);
		foreach (var link in e.Node.IncomingLinks)
			link.Origin.Brush = new SolidBrush(Color.LightBlue);
	}
	if (e.MouseButton == MouseButton.Right)
	{
		foreach (var node in e.Node.Query("outlinks/destination"))
			node.Brush = new SolidBrush(Color.LightGreen);
		foreach (var node in e.Node.Query("inlinks/origin"))
			node.Brush = new SolidBrush(Color.LightBlue);
	}
} 

I hope that helps,
Stoyan