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           if (File.Exists(Settings.Default.LastFile))
            {
                
            }					

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File.Exists(Settings.Default.LastFile)					

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            if (File.Exists(Settings.Default.LastFile))
            {
                File.Open(Settings.Default.LastFile, FileMode.Open);
            }					

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private void CreateTreeView(string filename, TreeNodeCollection nodes, bool import)
        {
            StreamReader sr = null;
            treeFile.BeginUpdate();
            try
            {
                sr = new StreamReader(filename, System.Text.Encoding.GetEncoding(1252));
                while (!sr.EndOfStream)
                {
                    string line = sr.ReadLine();

                    MappingElements SplitUp = new MappingElements(line, import);

                    ParseLineAndInsertNodesInTree(SplitUp.Elements, nodes, SplitUp);
                }
            }
            finally
            {
                sr.Close();
                treeFile.EndUpdate();
            }
        }

        private void ParseLineAndInsertNodesInTree(List<string> elements, TreeNodeCollection nodes, MappingElements splitup)
        {
            // mit dem ersten Element in elements einen neuen Knoten anlegen, sofern noch keiner vorhanden ist
            
            if (elements.Count > 0)
            {
                string keyString = elements[0];
                if (keyString.Equals(""))
                {
                    keyString = "LEER";
                }
                TreeNode tn = null;
                if (!nodes.ContainsKey(keyString))
                {
                    tn = new TreeNode(keyString);
                    tn.Name = keyString;
                    nodes.Add(tn);
                }
                else
                {
                    tn = nodes[keyString];
                }
                // wenn am Ende der Liste angekommen (resp. wenn auf unterster Ebene des Baums), dann
                // MappingElements-Objekt anhängen
                if (elements.Count == 1)
                {
                    tn.Tag = splitup;
                    splitup.Keystring = keyString;
                    DrawTreeNode(tn);
                }
                elements.RemoveAt(0);
                ParseLineAndInsertNodesInTree(elements, tn.Nodes, splitup);
            }
            treeFile.SelectedImageIndex = 2;
        }