Setting meta keys dinamically

How can I set the HTML Meta Keys dinamically??
I'm speaking about

<meta name="description" content="xxx">
<meta name="keywords" content="xxx">

Thanks!!

Even though both pieces of code are in VB, the methods called are the same
http://forums.asp.net/987603/ShowPost.aspx

Thank's MorningZ, this is just what I was looking for!!