SQL Server "in" equivalent in .Net
<p>I'm asking with my interest to learn:</p>

<pre><code>Select * from Customer where CustomerId in(12,23,45);
</code></pre>

<p>Similarly is there any C#.Net Keyword for the same above?</p>

<p>Example: verify Date(month) not in Oct,Nov Dec. (not in SQL or LINQ)</p>

<p>I did it with Extension method( <strong>Ternary operator</strong> and <strong>||</strong> by verifying with month)
I'm looking for simple way to verify, if exists.</p>
