public void Create(Operation operation)
{
db.Operations.Add(operation);
db.Entry(operation).State = EntityState.Added;
if (operation.Action == "transfer")
{
var billFrom = db.Bills.Find(operation.BillFromId);
billFrom.Amount = billFrom.Amount - operation.Amount;
db.Entry(billFrom).State = EntityState.Modified;
var billTo = db.Bills.Find(operation.BillToId);
billTo.Amount = billTo.Amount + operation.Amount;
db.Entry(billTo).State = EntityState.Modified;
}
db.SaveChanges();
}
public void Save()
{
db.SaveChanges();
}