C# Treeview checking if node exists

Question

I\'m trying to populate a treeview from an XmlDocument. The Root of the tree is set as \'Scripts\' and from the root the next level should be \'Departments\' which is within the

Answer 1

I use,

string department = node["DEPARTMENT"].InnerXml;
TreeNode node = parentNode.Nodes[department] ?? parentNode.Nodes.Add(department, department);

That line guarantees that a lookup of the value department will be done first, if not found it creates it. You have to do the double entry in Add() so it will have a key value you can do the lookup with the .Nodes[department].