AvalonStudio.TextEditor.Document.TextDocument.BeginUpdate C# (CSharp) Method

		public void BeginUpdate()
		{
			VerifyAccess();
			if (inDocumentChanging)
				throw new InvalidOperationException("Cannot change document within another document change.");
			beginUpdateCount++;
			if (beginUpdateCount == 1)
			{
				undoStack.StartUndoGroup();
				if (UpdateStarted != null)
					UpdateStarted(this, EventArgs.Empty);
			}
		}

 internal void RegisterAffectedDocument(TextDocument document)
 {
     if (affectedDocuments == null)
     {
         affectedDocuments = new List <TextDocument>();
     }
     if (!affectedDocuments.Contains(document))
     {
         affectedDocuments.Add(document);
         document.BeginUpdate();
     }
 }