How do I specify CSS classes for specific rows in a GridView?

I do something similar with RowDataBound:

if (e.Row.RowType == DataControlRowType.DataRow)
{
    // Check the XXXX column - if empty, the YYYY needs highlighting!
    if (e.Row.Cells[6].Text == " ")
    {
       e.Row.CssClass = "highlightRow"; // ...so highlight it
    }
}

One way to check that what you are doing is correct is to monitor your html output via the browser... something like Firebug really helps.

Here's some sample CSS, where we assign the CssClass 'dataGrid' to the Grid:

/* Used to highlight rows */
table.dataGrid tr.highlightRow td
{
    background-color: #FF6666;
    border-bottom: 1px solid #C0C0FF;
}

Update: Wiring all this up: I use auto-wire-up on the aspx page. Your page declaration looks something like this:

<%@ Page Language="C#" MasterPageFile="~/XXXXXX.master" AutoEventWireup="true" CodeBehind="YYYY.aspx.cs" Inherits="ZZZ.ZZZ.AAAAAA" Title="View Blah" %>

This setting on the page allows you to use the UI to connect up the events. Click the grid, select the properties, click the lightning-strike icon, and under the RowDataBound event, select your method. All this does behind the scenes is add an attribute to the DataGridView, thus:

        <asp:GridView ID="uiActionGridView" runat="server" AllowSorting="True" AutoGenerateColumns="False"
        OnRowDataBound="uiActionGridView_RowDataBound" OnDataBound="uiActionGridView_DataBound">

• this shows two events being wired-up, the DataBound and RowDataBound events.

This is what I do using VS2005 and it all seems to 'just work'. The only thing that I can think you are experiencing is that you are manually binding the event after the databind has occurred.