public virtual void SaveChanges()
{
foreach (EntityEntry entry in EntityEntries.ToList())
{
if ((entry.State & EntityState.Added) != 0 || (entry.State & EntityState.Modified) != 0)
{
entry.State = EntityState.Unchanged;
}
else if ((entry.State & EntityState.Deleted) != 0)
{
EntityEntries.Remove(entry);
}
}
}
