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var cbInfos = from c in dsTransVolumes.Tables[0].AsEnumerable()
join r in dsAssets.Tables[0].AsEnumerable() on
c.Field<string>("ID") equals r.Field<string>("ID")
select new
{
AsseTurnover = c.Field<decimal>("TransVolumes") / r.Field<decimal>("Assets"),
ID = c.Field<string>("ID"),
TransVolumes = c.Field<decimal>("TransVolumes"),
Assets = r.Field<decimal>("Assets")
};