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

		public void VerifyAccess()
		{
			if (Thread.CurrentThread != owner)
				throw new InvalidOperationException("TextDocument can be accessed only from the thread that owns it.");
		}

 DocumentLine IList <DocumentLine> .this[int index]
 {
     get
     {
         document.VerifyAccess();
         return(GetByNumber(1 + index));
     }
     set
     {
         throw new NotSupportedException();
     }
 }