public async Task Rename(string path, AbstractFile file)
        {
            using (NewFolderForm CrtFldrFrm = new NewFolderForm())
            {
                if (file.Type() == FileDir.File)
                {
                    ConcreteFile CurrentFile = (ConcreteFile)file;
                    CrtFldrFrm.SetItemName(CurrentFile.FileName);
                    CrtFldrFrm.ShowDialog();

                    if (CrtFldrFrm.DialogResult == DialogResult.OK)
                    {
                        await client.Files.MoveAsync(new RelocationArg(CurrentFile.FilePath, path + "/" + CrtFldrFrm.FolderName));
                    }
                }
                if (file.Type() == FileDir.Folder)
                {
                    ConcreteFolder CurrentFile = (ConcreteFolder)file;
                    CrtFldrFrm.SetItemName(CurrentFile.FolderName);
                    CrtFldrFrm.ShowDialog();

                    if (CrtFldrFrm.DialogResult == DialogResult.OK)
                    {
                        await client.Files.MoveAsync(new RelocationArg(CurrentFile.FolderPath, path + "/" + CrtFldrFrm.FolderName));
                    }
                }
            }
        }
        public async Task CreateFolder(string NewFolder)
        {
            using (NewFolderForm CrtFldrFrm = new NewFolderForm())
            {
                CrtFldrFrm.ShowDialog();

                if (CrtFldrFrm.DialogResult == DialogResult.OK)
                {
                    await client.Files.CreateFolderAsync(new CreateFolderArg(NewFolder + "/" + CrtFldrFrm.FolderName, true));
                }
            }
        }
		// Create a new folder.
		public void NewFolder()
				{
					NewFolderForm form = new NewFolderForm(currentDirectory);
					bool ok = false;
					try
					{
						if(form.ShowDialog(this) == DialogResult.OK)
						{
							ok = true;
						}
					}
					finally
					{
						form.DisposeDialog();
					}
					if(ok)
					{
						String dir = form.FolderName;
						if(dir != null)
						{
							ChangeDirectory(dir);
						}
					}
				}