What is the difference between the using statement and directive in C#?
<p>this is basically a tutorial question to ask since am a beginner I would like to what is a difference between the using statement we use at start of our C# code to include assembly and namespaces</p>

<p>like this:</p>

<pre><code>using System.Web.Services;
</code></pre>

<p>and when we write inside the code within the method or code.
like this:</p>

<pre><code>using (SqlDataAdapter adapter = new SqlDataAdapter(cmd))
</code></pre>

<p>is there any difference or they both are same, any guidance would be helpful and appreciated.</p>
