BExplorer.Shell.ShellTreeViewEx.ShellTreeView_AfterLabelEdit C# (CSharp) Method

		private void ShellTreeView_AfterLabelEdit(object sender, NodeLabelEditEventArgs e) {
			if (e.Label != null) {
				if (e.Label.Length > 0) {
					if (e.Label.IndexOfAny(new char[] { '@', '.', ',', '!' }) == -1) {
						// Stop editing without canceling the label change.
						e.Node.EndEdit(false);
						var fo = new IIFileOperation(this.Handle);
						fo.RenameItem((e.Node.Tag as IListItemEx)?.ComInterface, e.Label);
						fo.PerformOperations();
					} else {
						/* Cancel the label edit action, inform the user, and
							 place the node in edit mode again. */
						e.CancelEdit = true;
						MessageBox.Show("Invalid tree node label.\n The invalid characters are: '@','.', ',', '!'", "Node Label Edit");
						e.Node.BeginEdit();
					}
				} else {
					/* Cancel the label edit action, inform the user, and place the node in edit mode again. */
					e.CancelEdit = true;
					MessageBox.Show("Invalid tree node label.\nThe label cannot be blank", "Node Label Edit");
					e.Node.BeginEdit();
				}
			}
		}