passing string value to Data Access Layer

Hi All

Am just stuck to pass my string variable to my Data Access layer.

here is my main console

     class Program
    {
        static void Main(string[] args)
        {  
                String BookingTime="1000345";
                var BookingStart = new SchedSAPEntities.ResourceBookingEntity.ResourceBooking(string Bookingtime);
       }
}

SchedSAPEntities.ResourceBookingEntity.ResourceBooking(string Bookingtime);//Am trying to pass the string variable (1000345) to ResourceBooking method.

Here is my Data access Layer

     public class ResourceBookingEntity
    {
        public class ResourceBooking
        {
            private String _PRJ_ID;
                       
            public ResourceBooking(String APRJ_ID )
            {
                _PRJ_ID = APRJ_ID;
                
            }
            public String PRJ_ID { get { return _PRJ_ID; } }
            }
    }


      public class ResourceBookingList : List<SchedSAPEntities.ResourceBookingEntity.ResourceBooking>
        {
            public ResourceBookingList(SchedwinEntities db)
            {
                    var query =
                    (from PROJECTS in db.PROJECTS
                     join WOes in db.WOes on PROJECTS.PRJ_ID equals WOes.PRJ_ID
                     join SEVT_EX in db.SEVT_EX on SEVTs.SESID equals SEVT_EX.SESID into SEVT_EX_join
                     from SEVT_EX in SEVT_EX_join.DefaultIfEmpty()
                     where
                       (new string[] { "1", "2" }).Contains((PROJECTS.STAT.TrimEnd()).TrimStart()) &&
                       (WOes.STAT.TrimEnd()).TrimStart() == "6" &&
                       ((SEVTs.RESTYPE == 5 ||
                       SEVTs.RESTYPE == 0) &&
                       **SEVTs.T_START.TrimStart() == BookingStart**//Am trying to pass the value here
                     orderby
                       PROJECTS.PRJ_ID,
                       WOes.WONUM
                     select new
                     {
                         PROJECTS.PRJ_ID,
                                                 
                     }).Take(10);
                foreach (var r in query)
                    Add(new SchedSAPEntities.ResourceBookingEntity.ResourceBooking(
                        r.PRJ_ID, r.USER3, r.USER9, r.WONUM));
                        var ResourceBooking = query.ToList();
            }
        }

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