Список проголосовавших за комментарий "ivanovr,<br/> <blockquote>За то просто</blockquote>Согласен.<br/> <br/> Вот определил порог для (double)OrderNumber<br/> <br/> public void TestQuikOrderNumber()<br/> {<br/> <br/> var quikOrderNumber = <strong>8999999999999999</strong>d;<br/> var ulongOrder = Convert.ToUInt64(quikOrderNumber);<br/> Assert.<strong>AreEqual</strong>((ulong)<strong>8999999999999999</strong>, ulongOrder);<br/> <br/> quikOrderNumber = <strong>9999999999999999</strong>d;<br/> ulongOrder = Convert.ToUInt64(quikOrderNumber);<br/> Assert.<strong>AreNotEqual</strong>((ulong)<strong>9999999999999999</strong>, ulongOrder);<br/> }"