Hi,
Try this:
HTML:(Inside the grid.)
<footertemplate>
<asp:dropdownlist id="ddlInsuredTitle" runat="server" autopostback="true" onselectedindexchanged="ddlInsuredTitle_SelectedIndexChanged" xmlns:asp="#unknown" />
</footertemplate>
CodeBehind:
protected void ddlInsuredTitle_SelectedIndexChanged(object sender, EventArgs e)
{
}
--Amit