Code to traverse TreeView and generate the possible paths using C#

Here is the sample code for traversing the TreeView control and generating the possible paths

private void btnGeneratePathsFile_Click(object sender, EventArgs e)
        {
            foreach (TreeNode _rootNode in tvPath.Nodes)
            {
                TreeNode leafNode = FindLeafNode(_rootNode);
                //Result.Add(leafNode.FullPath.Replace("\\", " "));
            }
            System.IO.StreamWriter myFile = new System.IO.StreamWriter("c:\\output.txt");
            foreach (string strVal in Result)
            {
                myFile.WriteLine(strVal);
            }
            myFile.Close();

        }

TreeNode FindLeafNode(TreeNode RootNode)
        {
            TreeNode leafNode = default(TreeNode);
            leafNode = RootNode;
            foreach (TreeNode subNode in RootNode.Nodes)
            {
                if (subNode.Nodes.Count > 0)
                    leafNode = FindLeafNode(subNode);
                else
                    Result.Add(subNode.FullPath.Replace("\\", " "));
            }
            return leafNode;
        }