How to write to a <DIV>?

[nolc]

Hello,
Would anyone happen to know how to write to a <DIV> section? Thank you in advance....

HTML:
<DIV id="myDIV"></DIV>

Code Behind:
myDIV.text = "stuff"

[redsolo]

<DIV id="myDIV" runat="server"></DIV>
and make sure it is in <form ...runat="server"> tag