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Error: cannot be translated into a LINQ to Entities store expression

Posted By:      Posted Date: May 22, 2011    Points: 0   Category :ASP.Net
 

When I run my code i get this error:

The specified method '{0}' on the type '{1}' cannot be translated into a LINQ to Entities store expression

it happens in this part of the code:

 public Boolean valtOpVerlofDag(Dictionary<string, object> afw)
        {
            DateTime start = DateTime.Parse((string)afw["startDatum"]);
            IEnumerable<Period> holidays = from hol in periods
                                               where (hol.Type == "Holiday") && hol.IsInPeriod(start)
                                               select hol;
            if (holidays.Count() == 0)
          


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