Linq Queries - Update data in query

Linq Queries - Update data in query

how to update an item in a list by linq

public static class UpdateExtensions
    {
        public delegate void Func<TArg0>(TArg0 element);

        public static int Update<TSource>(this IEnumerable<TSource> source, Func<TSource> update)
        {
            if (source == null) throw new ArgumentNullException("source");
            if (update == null) throw new ArgumentNullException("update");
            if (typeof(TSource).IsValueType)
                throw new NotSupportedException("value type elements are not supported by update.");

            int count = 0;
            foreach (TSource element in source)
            {
                update(element);
                count++;
            }
            return count;
        }
    }

Use update extension

var Datas = from ev in db.Events
                            join ea in db.EventAttendees on ev.EventId equals ea.EventId
                            where ea.UserId == userid
                            select new VMEvent
                            {
                                EventName = ev.EventName,
                                EventAttendeeSubmittedDate = ea.SubmittedDate.ToString(),
                                Place = ev.Place, 
                                EventAttendeeNoofMembers = ea.noofMembers.ToString() 
                             }; 

  var query = (from items in Datas
                             select items)
                          .Update(st => { st.EventDateString = st.EventDate.ToString("dd/M/yyyy", CultureInfo.InvariantCulture);  });

Enjoy !!!
:)