public override bool Equals(object obj) { if (obj is Order o) { return(Orderkey.Equals(o.Orderkey) && Custkey.Equals(o.Custkey) && Orderstatus.Equals(o.Orderstatus) && Totalprice.Equals(o.Totalprice) && Orderdate.Equals(o.Orderdate) && Orderpriority.Equals(o.Orderpriority) && Clerk.Equals(o.Clerk) && Shippriority.Equals(o.Shippriority) && Comment.Equals(o.Comment)); } return(false); }