Adding a new root node to a existing treeview's parent node

Question

I selected the parent node (the top) in treeview. and now i need to add a new parent node to the existing parent node dynamicly. here is my way of solving to the problem: `

treeView1.SelectedNode.Parent.Nodes.Add(textBox1.Text.Trim());
//here comes an error of null reference argument

//To avoid that error,i tried it in this way:
   if (treeView1.SelectedNode.Parent == null)
        treeView1.SelectedNode.Parent=new TreeNode(textBox1.Text.Trim());

` But it still returns an error. Help me solve this. Thanks guys!

MrApnea · Accepted Answer · 2016-12-13 11:44:30Z

1

Trying this wont work:

treeView1.SelectedNode.Parent.Nodes.Add(textBox1.Text.Trim());

Since you are trying to find the Parent of the top node who doesn't have a top node.

To add a new top node you need to add it to the list of top nodes:

treeView1.Nodes.Add(textBox1.Text.Trim());

answered Dec 13, 2016 at 11:44

MrApnea

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