Note that you may want to send this type of request with code formatting in the future. 
Here is what I would write (fixed):
using (var txScope = IceContext.CreateDefaultTransactionScope())
{
foreach(var tt in ttMasterPack.Where(tt => tt.Updated() && tt.TrackingNumber != ""))
{
foreach (var q in (from D in Db.MasterPackDtl.Where(D => D.Company == tt.Company && D.PackNum == tt.PackNum)
join S in Db.ShipHead on
new {D.Company, D.DtlPackNum} equals
new {S.Company, DtlPackNum = S.PackNum}
where S.TrackingNumber != tt.TrackingNumber
select S))
{
q.TrackingNumber = tt.TrackingNumber;
}
}
Db.Validate();
txScope.Complete();
}