public async Task <IPagedList <Customer> > ListAsync(QueryStringParameters parameters)
{
var query = context.Customer
.Include(c => c.CustomerAddress)
.ThenInclude(ca => ca.Address) as IQueryable <Customer>;
query = parameters.Filter(query);
query = parameters.Search(query);
query = parameters.OrderBy(query);
var pagedList = await query.ToPagedListAsync(parameters.PageNumber, parameters.PageSize);
return(pagedList);
}