C# – Adding child nodes to a treeview in C#

ctreeview

I have a treeview that contains Car Makes and their respective Models. I have a button that adds a new Make (parent Node).

private void btnMake_Click(object sender, EventArgs e)
{
    string inputMake;
    inputMake = Microsoft.VisualBasic.Interaction.InputBox("Enter Make: ", "Add Car Manufacturer");
    carMake.Add(inputMake); // arrayList to store car Makes
    carTree.Nodes.Add(new TreeNode(inputMake));
}

What I am having problems with is adding Model (child nodes). I have a button to add model and I don't know how to differentiate the appropriate parent node.

I currently have the following code:

private void btnModel_Click(object sender, EventArgs e)
{
    string inputModel;
    int index = carTree.Nodes.IndexOf(carTree.SelectedNode);
    //MessageBox.Show(carMake[index].ToString());
    //inputModel = Microsoft.VisualBasic.Interaction.InputBox("asfdasdf", "asdfasdf");
    //carTree.Nodes[index].Nodes.Add(new TreeNode(inputModel));
}

The last lines are commented out due to testing . . . I am putting the care Makes (parent nodes) into an ArrayList but am having issues accessing the arraylist. This line returns an error:

 //MessageBox.Show(carMake[index].ToString());

Ultimately I would like some help with the most efficient way to add child nodes to a respective parent node.

Best Answer

Try this : 

if(carTree.SelectedNode == null)
  MessageBox.Show("Please select a node first");    

carTree.SelectedNode.Nodes.Add(new TreeNode("Child"));
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