private void BtnResolve_Click(object obj) { Result = string.Empty; if (_forest == null) { return; } IItemNumerical item = _forest.CreateItem(); int i = 0; foreach (NameValue nv in NameValueList) { item.SetValue(nv.Name, nv.Value); i++; } if (i == 0) { return; } double res = _forest.Resolve(item); Result = res.ToString(); }