public static string parentClassSignature(this O2MappedAstData astData, INode iNode)
        {
            var typeDeclaration = iNode.parent <TypeDeclaration>();

            if (typeDeclaration.notNull())
            {
                var iClass = astData.iClass(typeDeclaration);
                if (iClass.notNull())
                {
                    return(iClass.DotNetName);
                }
            }
            return("");
        }