private Hashtable GetCurrencyManagers(System.Windows.Forms.Form f)
{
	Hashtable res = new Hashtable();
	Hashtable listManagers = typeof(System.Windows.Forms.BindingContext).GetField(
		"listManagers",
		System.Reflection.BindingFlags.NonPublic|System.Reflection.BindingFlags.Instance
	).GetValue(f.BindingContext) as Hashtable;
	foreach(System.WeakReference wr in listManagers.Values)
	{
		CurrencyManager cm = (CurrencyManager)wr.Target;
		res.Add(cm, cm.Position);
	}
	return res;
}
...
Hashtable listManagers = this.GetCurrencyManagers(this);
this.ReloadData(); //В этом методе делается .Clear()
foreach(CurrencyManager cm in listManagers.Keys)
{
	cm.Position = (int)listManagers[cm];
}