System.IO.Directory.GetParent C# (CSharp) Method

        public static System.IO.DirectoryInfo GetParent(string path) { throw null; }
        public static void Move(string sourceDirName, string destDirName) { }

        private void tsbImport_Click(object sender, EventArgs e)
        {
            if (_fs == null)
            {
                return;
            }

            var ofd = new OpenFileDialog();

            ofd.Title = "Import...";

            if (_lastImportExportPath != null)
            {
                ofd.InitialDirectory = _lastImportExportPath;
            }

            ofd.CheckFileExists = true;
            ofd.CheckPathExists = true;
            ofd.Multiselect     = true;

            if (ofd.ShowDialog() == DialogResult.OK)
            {
                _lastImportExportPath = IODirectory.GetParent(ofd.FileName).FullName;

                List <string> _invalidFiles = new List <string>();
                using (new WaitCursor(this))
                {
                    for (var i = 0; i < ofd.FileNames.Length; i++)
                    {
                        var  safename = Path.GetFileName(ofd.FileNames[i]);
                        File file     = FindFileByName(safename);
                        if (file == null)
                        {
                            _invalidFiles.Add(safename);
                        }
                        else
                        {
                            byte[] data = IOFile.ReadAllBytes(ofd.FileNames[i]);
                            file.SetData(data);
                        }
                    }
                }

                if (_invalidFiles.Count > 0)
                {
                    var sb = new StringBuilder();
                    foreach (var s in _invalidFiles)
                    {
                        sb.Append("  " + s + "\n");
                    }
                    MessageBox.Show("The following files were not found in the archive to be replaced:\n\n" + sb +
                                    "\nPlease note that you can not add new files, only replace existing ones. The files must be named exactly " +
                                    "as they are in the archive.", "Import", MessageBoxButtons.OK,
                                    MessageBoxIcon.Exclamation);
                }

                PopulateListView();
            }
        }