在“编辑” LINQ to SQL实体时，我可以简单地将一项分配给另一项吗？

void AlterItem(Orderable o) {  
    foreach(Orderable p in from Orderable n in dataContext.Orderables 
            where n.UID == o.UID 
            select n)  
    p = o;  
    dataContext.SubmitChanges();

p = o;

p

void AlterItem(Orderable o)
{
   var p = dataContext.Orderables.First();
   p = o;
   dataContext.SubmitChanges();
}

foreach

var p = dataContext.Orderables.First();
p.Property1 = o.Property1;
// etc...
dataContext.SubmitChanges();