Get that code  out of Page_Load

Have it live in a sub or method.

Have the visible  property set invoke the method or the page.

Look at:
www.learnasp.com/.../sourcecode-searcheruc.aspx

specifically:
dbgrid.ascx

The database population code could not live in Page_Load because it would fire before the button event that gave it correct SQL. So that code lives in a sub called DataBind() although it could have been called GoGetdata() or whatever...