how to format [decimal?] when it's null?
<p>in my class partData the FW_Step attribute  isfrom the type  double?</p>

<p>when i try to format it like that</p>

<pre><code>partData.FW_Step.Value.ToString("F3")
</code></pre>

<p>it's fail when the value is null</p>

<p>how can i use the format when the value is null?</p>
