Help refactoring this C# function
<p>I have written functions that look like this:</p>

<pre><code>bool IsDry(bool isRaining, bool isWithUmbrella) {
    if (isRaining) {
        if (isWithUmbrella)
            return true;
        else
            return false;
    }
    else
        return true;
}
</code></pre>

<p>I need to check, if it's raining, then the person needs to carry an umbrella in order to keep dry (don't laugh, this is just an example, our actual business rules are more serious than this).</p>

<p>How can I refactor this, because right now it looks clumsy.</p>

<p>Thanks for the help, guys! =)</p>
