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How to return DateTimeOffset type with Linq
public DateTimeOffset GetLastDate(Guid Id, Guid AppId)
{
   var q = from k in context.Inspections
           where k.Id == Id || k.AppId == AppId
           select k.Duedate;
   return q;
}

var q = from k in context.Inspections
            where k.Id== Id||k.AppId== AppId
            select k.Duedate;
    DateTimeOffset? value = q.First();

    if (value.HasValue)
        return value.Value;
    else // found NULL in DB! Do something in this case...
        throw new ApplicationException("Null offset found");

    // Alternatively, you could use some default value (this uses "Now"):
    // return value ?? DateTimeOffset.Now;