やあやあ
gamen.Syokuhi = dataRows
.Where(e => e["データ区分"] == 0)
.Select(e => e.["データ値"])
.Sum();

gamen.Kounetsuhi = dataRows
.Where(e => e["データ区分"] == 1)
.Select(e => e.["データ値"])
.Sum();

gamen.pachinkoKubun = dataRows
.Where(e => e["データ区分"] == 2)
.Select(e => e.["パチンコ区分"] == "W" ? -e["データ値"] : e["データ値"])
.Sum();

gamen.PachinkoCss = gamen.Pachinkohi < 0 ? "gold" : "black";