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src/Privatezilla/Interfaces/IListView.cs

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+using System;
+using System.Collections;
+using System.Windows.Forms;
+
+namespace Privatezilla
+{
+    /* Modified ListView sort example from https://support.microsoft.com/en-us/kb/319401
+       which will not only sort ascending but both ways */
+
+    public class ListViewItemComparer : IComparer
+    {
+        private readonly int col;
+        private readonly bool bAsc = false;
+
+        public ListViewItemComparer()
+        {
+            col = 0;
+        }
+
+        public ListViewItemComparer(int column, bool b)
+        {
+            col = column;
+            bAsc = b;
+        }
+
+        public int Compare(object x, object y)
+        {
+            if (bAsc)
+            {
+                return String.Compare(((ListViewItem)x).SubItems[col].Text, ((ListViewItem)y).SubItems[col].Text);
+               // bAsc = false;
+            }
+            else
+            {
+                return String.Compare(((ListViewItem)y).SubItems[col].Text, ((ListViewItem)x).SubItems[col].Text);
+               //  bAsc = true;
+            }
+        }
+    }
+}

src/Privatezilla/Interfaces/ITreeNode.cs

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+using System;
+using System.Collections.Generic;
+using System.Windows.Forms;
+
+namespace Privatezilla.ITreeNode
+{
+    public static class ITreeNode
+    {
+        // Retrieving TreeView nodes as IEnumerable
+        public static IEnumerable<TreeNode> All(this TreeNodeCollection nodes)
+        {
+            if (nodes == null)  throw new ArgumentNullException(nameof(nodes));
+          
+            foreach (TreeNode n in nodes)
+            {
+                yield return n;
+
+                foreach (TreeNode child in n.Nodes.All())
+                {
+                    yield return child;
+                }
+            }
+        }
+    }
+}