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List<DateTime> listDate = new List<DateTime>();
var T4List = from T3 in listDate
join T2 in db.Table1
on T3.Date equals T2.Date into gop2
from Temp in gop2.DefaultIfEmpty()
select new
{
Date = T3.Date,
Count = Temp.OriginalCount == null ? 0 : Temp.OriginalCount
};