web controls paging, sorting and selection from other controls

[Jason]

I've got a gridview with built in paging and sorting and a datasource
tag in the aspx.

I wanted to change the selection criteria based on a dropdrown list
selection, so I created even

_SelectedIndexChanged event, and now I get an event was not handled
when I select paging or sorting links.

Before that there were issues where having a datasource in the asp.net
code conflicted with attempts to set a datasource in the gridview I am
generating and would like to have multiple ways of impacting.

Here's how I was binding it in code:

xGridView.DataSource = somedataset
xGridView.DataBind()

Also, is there a way to bindbased on the exsisting datasourceid?