ICSharpCode.AvalonEdit.Document.TextDocument.ThrowIfRangeInvalid C# (CSharp) Method

        void ThrowIfRangeInvalid(int offset, int length)
        {
            if (offset < 0 || offset > rope.Length) {
                throw new ArgumentOutOfRangeException("offset", offset, "0 <= offset <= " + rope.Length.ToString(CultureInfo.InvariantCulture));
            }
            if (length < 0 || offset + length > rope.Length) {
                throw new ArgumentOutOfRangeException("length", length, "0 <= length, offset(" + offset + ")+length <= " + rope.Length.ToString(CultureInfo.InvariantCulture));
            }
        }