TreeView - helper

protected void Page_Load(object sender, EventArgs e)
    {
        ArrayList aList = new ArrayList();
        ArrayList aList1 = new ArrayList();
        ArrayList aList2 = new ArrayList();
        ArrayList aList3 = new ArrayList();
        ArrayList aList4 = new ArrayList();
        ArrayList aList5 = new ArrayList();
        aList.Add("Additional Documents/test/doc3.docx");
        aList.Add("Additional Documents/test/doc3.docx");
        aList.Add("Additional Documents/test/test1/test1123.docx");
        aList.Add("Additional Documents/test/test1/test134.docx");
        aList.Add("Additional Documents/test/test1/test156.docx");
 
        aList.Add("Additional Documents/Apple/Cat/three/Four/Fourdoc1.docx");
        aList.Add("Additional Documents/Apple/Cat/three/Four/Fourss.docx");
 
        aList.Add("Additional Documents/Apple/Ball/balloc1.docx");
        aList.Add("Additional Documents/Apple/Ball/balldoc1.docx");
        aList.Add("Additional Documents/Apple/Ball/I/i.docx");
        aList.Add("Additional Documents/Apple/Ball/I/ii.docx");
        aList.Add("Additional Documents/Apple/Ball/I1/jj.docx");
        aList.Add("Additional Documents/Apple/Ball/I2/kk.docx");
        aList.Add("Additional Documents/Apple/Ball/I3/ll.docx");
        aList.Add("Additional Documents/Apple/Ball/I4/MM.docx");
        aList.Add("Additional Documents/1/2/3/4/444.docx");
        aList.Add("Additional Documents/1/2/3/4/5644.docx");
        aList.Add("Additional Documents/test/test1/a2.docx");
        aList.Add("Additional Documents/Apple/Two/Twooc1.docx");
        aList.Add("Additional Documents/test/fff.docx");
        aList.Add("Additional Documents/test/intest/abc.docx");
        aList.Add("Additional Documents/test/intest1/aaa.docx");
        aList.Add("Additional Documents/test/test1/a1.docx");
       
        aList.Add("Additional Documents/test/test1/a3.docx");
        aList.Add("Additional Documents/test/test1/T/b1.docx");
        aList.Add("Additional Documents/test/test1/T/b2.docx");
        aList.Add("Additional Documents/test/test1/TT/bb3.docx");
 
 
        aList.Add("Additional Documents/test/test1/test2/test3/test4/vvvooSiste.docx");
        aList.Add("Additional Documents/test/test1/test2/test3/test4/sdsds.docx");
        aList.Add("Additional Documents/test/test1/test2/test3/33.docx");
        aList.Add("Additional Documents/test/test1/test2/test3/t5.docx");
 
        #region add level sorting
        
      
        foreach (var item in aList)
        {
            string[] List = item.ToString().Split('/'); string RootValuePath = string.Empty;
             List = Array.FindAll(List, val => val != List[0]).ToArray();
             if (List.Length-1>=5)
             {
                 foreach (var itemx in List.Take(6))
                 {
                     RootValuePath += itemx.ToString() + "/";
                 }
                 aList5.Add(RootValuePath.TrimEnd('/'));
             }
             if (List.Length-1 == 4)
             {
                 foreach (var itemx in List.Take(5))
                 {
                     RootValuePath += itemx.ToString() + "/";
                 }
                 aList4.Add(RootValuePath.TrimEnd('/'));
             }
             if (List.Length - 1 == 3)
             {
                 foreach (var itemx in List.Take(4))
                 {
                     RootValuePath += itemx.ToString() + "/";
                 }
                 aList3.Add(RootValuePath.TrimEnd('/'));
             }
             if (List.Length - 1 == 2)
             {
                 foreach (var itemx in List.Take(3))
                 {
                     RootValuePath += itemx.ToString() + "/";
                 }
                 aList2.Add(RootValuePath.TrimEnd('/'));
             }
 
 
        }
        #endregion
        #region Firth Level
        aList5.Sort();
        foreach (var item in aList5)
        {
             string[] List = item.ToString().Split('/'); string RootValuePath = string.Empty;
            #region >fifth level          
            if (List.Length>= 5)
            {
                foreach (var itemx in List.Take(5))
                {
                    RootValuePath += itemx.ToString() + "/";
                }
                TreeNode findNode = treeView.FindNode(RootValuePath.TrimEnd('/'));
                if (findNode == null)
                {
                    for (int i = 0; i < List.Length; i++)
                    {
                        if (!IsNodeExit(treeView, List[i].ToString()))
                        {
                            if (i == 0)
                            {
                                treeView.Nodes.Add(new TreeNode(List[i].ToString()));
                            }
                            if (i == 1)
                            {
                                treeView.FindNode(List[0].ToString()).ChildNodes.Add(new TreeNode(List[i].ToString()));
                            }
                            if (i == 2)
                            {
                                treeView.FindNode(List[0].ToString() + "/" + List[1].ToString()).ChildNodes.Add(new TreeNode(List[i].ToString()));
                            }
                            if (i == 3)
                            {
                                treeView.FindNode(List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString()).ChildNodes.Add(new TreeNode(List[i].ToString()));
                            }
                            if (i == 4)
                            {
                                treeView.FindNode(List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString() + "/" + List[3].ToString()).ChildNodes.Add(new TreeNode(List[i].ToString()));
                            }
                            if (i == 5)
                            {
                                treeView.FindNode(List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString() + "/" + List[3].ToString() + "/" + List[4].ToString()).ChildNodes.Add(new TreeNode(List[i].ToString()));
                            }
                          
                        }
                    }
                }
                else
                {
                    treeView.FindNode(List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString() + "/" + List[3].ToString() + "/" + List[4].ToString()).ChildNodes.Add(new TreeNode(List[5].ToString()));
                }
            }
            #endregion
        }
        #endregion
        #region 4th level
 
        aList4.Sort();
        foreach (var item in aList4)
        {
            string[] List = item.ToString().Split('/'); string RootValuePath = string.Empty;
            foreach (var itemx in List.Take(4))
            {
                RootValuePath += itemx.ToString() + "/";
            }
            if (!IsNodeExit(treeView, RootValuePath.TrimEnd('/')))
            {
                if (!IsNodeExit(treeView, List[0].ToString()))
                {
                    treeView.Nodes.Add(new TreeNode(List[0].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString() + "/" + List[1].ToString()))
                {
                    treeView.FindNode(List[0].ToString()).ChildNodes.Add(new TreeNode(List[1].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString()))
                {
                    treeView.FindNode(List[0].ToString() + "/" + List[1].ToString()).ChildNodes.Add(new TreeNode(List[2].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString() + "/" + List[2].ToString()))
                {
                    treeView.FindNode(List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString()).ChildNodes.Add(new TreeNode(List[3].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString() + "/" + List[2].ToString()))
                {
                    treeView.FindNode(List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString() + "/" + List[3].ToString()).ChildNodes.Add(new TreeNode(List[4].ToString()));
                }
            }
            else
            {
                treeView.FindNode(RootValuePath.TrimEnd('/')).ChildNodes.Add(new TreeNode(List[4].ToString()));
            }
        }
        #endregion
        #region 3 level
 
        aList3.Sort();
        foreach (var item in aList3)
        {
            string[] List = item.ToString().Split('/'); string RootValuePath = string.Empty;
            foreach (var itemx in List.Take(3))
            {
                RootValuePath += itemx.ToString() + "/";
            }
            if (!IsNodeExit(treeView, RootValuePath.TrimEnd('/')))
            {
                if (!IsNodeExit(treeView, List[0].ToString()))
                {
                    treeView.Nodes.Add(new TreeNode(List[0].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString()+"/"+List[1].ToString()))
                {
                    treeView.FindNode(List[0].ToString()).ChildNodes.Add(new TreeNode(List[1].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString()))
                {
                    treeView.FindNode(List[0].ToString() + "/" + List[1].ToString()).ChildNodes.Add(new TreeNode(List[2].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString() +"/" + List[2].ToString()))
                {
                    treeView.FindNode(List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString()).ChildNodes.Add(new TreeNode(List[3].ToString()));
                }
            }
            else
            {
                treeView.FindNode(RootValuePath.TrimEnd('/')).ChildNodes.Add(new TreeNode(List[3].ToString()));
            }
        }
        #endregion
        #region 2 level
 
        aList2.Sort();
        foreach (var item in aList2)
        {
            string[] List = item.ToString().Split('/'); string RootValuePath = string.Empty;
            foreach (var itemx in List.Take(2))
            {
                RootValuePath += itemx.ToString() + "/";
            }
            if (!IsNodeExit(treeView, RootValuePath.TrimEnd('/')))
            {
                if (!IsNodeExit(treeView, List[0].ToString()))
                {
                    treeView.Nodes.Add(new TreeNode(List[0].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString() + "/" + List[1].ToString()))
                {
                    treeView.FindNode(List[0].ToString()).ChildNodes.Add(new TreeNode(List[1].ToString()));
                }
                if (!IsNodeExit(treeView, List[0].ToString() + "/" + List[1].ToString() + "/" + List[2].ToString()))
                {
                    treeView.FindNode(List[0].ToString() + "/" + List[1].ToString()).ChildNodes.Add(new TreeNode(List[2].ToString()));
                }
            }
            else
            {
                treeView.FindNode(RootValuePath.TrimEnd('/')).ChildNodes.Add(new TreeNode(List[2].ToString()));
            }
        }
        #endregion
       // SortTreeNodes(treeView.Nodes);
        treeView.CollapseAll();
        treeView.ShowLines = true;
    }
 
    public bool IsNodeExit(TreeView trview, string text)
    {
        TreeNode node = treeView.FindNode(Server.HtmlEncode(text));
        if (node != null)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    private void sort(TreeNode node)
    {
        foreach (TreeNode n in node.ChildNodes)
            sort(n);
        try
        {
            TreeNode temp = null;
            List<TreeNode> childs = new List<TreeNode>();
            while (node.ChildNodes.Count > 0)
            {
                foreach (TreeNode n in node.ChildNodes)
                    if (temp == null || n.Text[0] < temp.Text[0])
                        temp = n;
                node.ChildNodes.Remove(temp);
                childs.Add(temp);
                temp = null;
            }
            node.ChildNodes.Clear();
            foreach (TreeNode a in childs)
                node.ChildNodes.Add(a);
        }
        catch { }
    }
    private void SortTreeNodes(TreeNodeCollection treeNodes)
    {
        var sorted = true;
 
        foreach (TreeNode treeNode in treeNodes)
        {
            SortTreeNodes(treeNode.ChildNodes);
        }
 
        do
        {
            sorted = true;
 
            for (var i = 0; i < treeNodes.Count - 1; i++)
            {
                var treeNode1 = treeNodes[i];
                var treeNode2 = treeNodes[i + 1];
 
                if (treeNode1.Text.CompareTo(treeNode2.Text) > 0)
                {
                    treeNodes.RemoveAt(i + 1);
                    treeNodes.RemoveAt(i);
 
                    treeNodes.AddAt(i, treeNode2);
                    treeNodes.AddAt(i + 1, treeNode1);
                }
            }
        } while (!sorted);
    }