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copied!<p>First of all, <a href="http://msdn.microsoft.com/en-us/library/bb351562.aspx" rel="noreferrer" title="MSDN reference"><code>IQueryable<T></code></a> <em>extends</em> the <code>IEnumerable<T></code> interface, so anything you can do with a "plain" <code>IEnumerable<T></code>, you can also do with an <code>IQueryable<T></code>. </p> <p><code>IEnumerable<T></code> just has a <code>GetEnumerator()</code> method that returns an <code>Enumerator<T></code> for which you can call its <code>MoveNext()</code> method to iterate through a sequence of <em>T</em>.</p> <p>What <code>IQueryable<T></code> has that <code>IEnumerable<T></code> <em>doesn't</em> are two properties in particular—one that points to a <strong>query provider</strong> (e.g., a LINQ to SQL provider) and another one pointing to a <strong>query expression</strong> representing the <code>IQueryable<T></code> object as a runtime-traversable abstract syntax tree that can be understood by the given query provider (for the most part, you can't give a LINQ to SQL expression to a LINQ to Entities provider without an exception being thrown).</p> <p>The expression can simply be a constant expression of the object itself or a more complex tree of a composed set of query operators and operands. The query provider's <code>IQueryProvider.Execute()</code> or <code>IQueryProvider.CreateQuery()</code> methods are called with an <em>Expression</em> passed to it, and then either a query result or another <code>IQueryable</code> is returned, respectively.</p>

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