ICSharpCode.AvalonEdit.Editing.Selection.IsMultiline C# (CSharp) Method

        public virtual bool IsMultiline(TextDocument document)
        {
            if (document == null)
                throw new ArgumentNullException("document");
            ISegment surroundingSegment = this.SurroundingSegment;
            if (surroundingSegment == null)
                return false;
            int start = surroundingSegment.Offset;
            int end = start + surroundingSegment.Length;
            return document.GetLineByOffset(start) != document.GetLineByOffset(end);
        }