using HandyControl.Data; namespace HandyControlDemo.UserControl { public partial class NumericUpDownDemoCtl { public NumericUpDownDemoCtl() { InitializeComponent(); NumericUpDownCustomVerify.VerifyFunc = str => double.TryParse(str, out var v) ? v % 2 < 1e-06 ? OperationResult.Failed(Properties.Langs.Lang.Error) : OperationResult.Success() : OperationResult.Failed(Properties.Langs.Lang.Error); } } }