<p>Explain why a nullable int can't be assigned the value of null e.g</p>

<pre><code>int? accom = (accomStr == "noval" ? null  : Convert.ToInt32(accomStr));
</code></pre>

<p>What's wrong with that code?</p>

The problem isn't that null cannot be assigned to an int?. The problem is that both values returned by the ternary operator must be the same type, or one must be implicitly convertible to the other. In this case, null cannot be implicitly converted to int nor vice-versus, so an explict cast is necessary. Try this instead:
```
```
int? accom = (accomStr == "noval" ? (int?)null : Convert.ToInt32(accomStr));
```
```