var inTable = (from a in dbInspections.AsEnumerable()
                join b in table.AsEnumerable() on 1 equals (1)
                join c in tableDateDB.AsEnumerable() on 1 equals (1)
                where (a.Field<string>("company") ?? "") == (b.Field<string>("company") ?? "") &&
                      (a.Field<string>("building") ?? "") == (b.Field<string>("building") ?? "") &&
                      (a.Field<string>("numITP") ?? "") == (b.Field<string>("numITP") ?? "") &&
                      (a.Field<string>("ITPsumInfo") ?? "") == (b.Field<string>("ITPsumInfo") ?? "") &&

                      a.Field<int>("id") == c.Field<int>("idMain") &&
                      c.Field<DateTime>("dateInspection") >= minDat && c.Field<DateTime>("dateInspection") <= maxDat
                select c.Field<int?>("id")).Distinct();