Question

When I was trying to copy node from one treeview to another, I got a strange error: “Cannot add or insert the item ‘node1’ in more than one place. You must first remove it from its current location or clone it.
Parameter name: node”
After searching for a while, I couldn’t find any solution. I tried this in VB.NET and had the same error
Code example:

TreeNode node1 = new TreeNode("node1");
node1.Name = "node1";
treeView1.Nodes.Add(node1);
TreeNode nd = treeView1.Nodes[0];
treeView2.Nodes.Add(nd);

Are there any solutions for this?

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Thanks everyone! This works now!

Answer 1

yes ,use deep copy

TreeNode nd = (TreeNode )treeView1.Nodes[0].Clone();

change your code to this

TreeNode node1 = new TreeNode("node1");
node1.Name = "node1";
treeView1.Nodes.Add(node1);
TreeNode nd = (TreeNode )treeView1.Nodes[0].Clone(); // clone the object
treeView2.Nodes.Add(nd);