protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Header)
        {
            foreach (DataControlFieldHeaderCell Cell in e.Row.Cells)
            {
                if (Cell.Controls.Count == 1)
                {
                    //get the containing field
                   


                    LinkButton LinkButton = Cell.Controls[0] as LinkButton;

                    if (LinkButton != null)
                    {
                        LinkButton.ToolTip = Cell.ContainingField.HeaderText;

                       
                    }

                    ImageButton ImageButton = Cell.Controls[0] as ImageButton;

                    if (ImageButton != null)
                    {

                        ImageButton.ToolTip = Cell.ContainingField.HeaderText;
                        
                    }
                }
            }
        }
    }

Here is what the code does:

1. The method is called on the 'RowDataBound' even of the gridview
2. Check to make sure we are only checking the header
3. Loops thru all Row.Cell as DataControlFieldHeaderCell. The 'DataControlFieldHeaderCell' object contains a reference to 'ContainingField' - which has all of the information such as HeaderText, FooterText, etc.
4. Cast the first child control as ImageButton. If successful, then set the tooltip to Cell.ContainingField.HeaderText.
5. Cast the first child control as ImageButton. If successful, then set the tooltip to Cell.ContainingField.HeaderText.

Test.

;)

• Avalon - advanced object presentation sytem using GPU rendering and vectors. Flash on steroids for the desktop!
  
• Indigo - advanced network protcol designed as next gen WSDL service plus just about most everything else. Kind of a 'There can be only one!' model for network rpc.
  
• WinFS - object based files sytem for local storage. Take a file sytems and a database, put them in a blender, that's what you get.

Two out of three are shipping in Vista, and while these Avalon and Indigo are new technolgies (managed-coded based and thank God for that!) they are just the next in a line of existing technologies. Avalon replaces GDI and GDI plus and the Win32 control model. Indigo replaces dcom, and .net asmx and remoting as tne network rpc of choice. But WinFS is new and that I know of not been done before in a consumer oriented OS. (If so, tell me about it.) WinFS is the actualization of the OFS concept. Here's the history in brief. They have been at this for a while and I think the time is right for it to be done. Processors are scaling up to multicore designs that are mainstream. Dual Core is 2006, Quad Core is 2008. Hard drives are scaling up towards a 1TB on the high end and over 100G for notebooks. Database technologies are being commoditized thanks to MySQL and other players, and XML is becoming the best way to represent objects as text. Put all of these things in a blender and you have the right environment to build WinFS. 

It's what's missing from Vista and part of the reason that Vista is so sparse on new features that are tangible. Perhaps Project Orange will change that. But the basic seach features are there and there have been signifigant upgrades to NTFS to allow for WinFS. If you want to couple a file and database system together and you want them to be in sync, you need transactions. Thus, transactional NTFS.

And that brings us to "Windows Vista R1". While the PDC 2003 vision was grand, it wasn't really doable. Just as you cannot build a house on a concreatre foundation that is wet, you cannot build an OS on technolgies that are unstable. At one point before the Reset the Explorer was being rewritten in managed code and based on Avalon. When Avalon changed, Explorer broke. Repeat cycle. So the Reset happened and Vista became about getting the new technogies in place for MS to build on. What you actually see in Vista is just a courtesty from MS in my opinion, as there are many new changes to come in the visual department down the road. So hopefull the Vista R2 in 2009 (est.) will complete the journey by adding WinFS and hopefully, and this is just a hope, an Avalon rendered shell that actuallys look great at high dpi.

1. Favorite Links - Yep, I'm pretty sure that this is in OSX, but it's nice to have anyway. All you have to do is drag a folder under the 'Favorite Links' panel - basically the whole left panel of the Finder, and Vista will make a short cut for you to that folder. As hard as XP wanted to be helpful, it never did this one simple thing. This is a life saver. I wont have to build out a quick launch toolbar anymore to links such as the ASp.net compilation directory, or  Inetpub, or VS Project folder. I can just put it in the Finder and it rembmers. Links to 'Document', 'Pictures', 'Music' and "Recently Changed' are included.
   
2. Folders - Here is where the 'Finder' thing comes into play. See it there at the bottom of the 'Favorite Links' panel. Well, that the Explorer tree navigation in all it's glory and it's one of those expandable panels. Except for the triangles, and that makes it the whole application now referred to by me as  Finder. But you know what to do here.
   
   Now I have got to admit MS did their homework here and just made this combination work of Favorite Links and Folders work. But that's not the cool part. Read on.
   
3. The 'up' button is dead. This is causing hysterics by some on the the Channel 9 forum. Well, the new Finder breadcrumbs are VERY COOL. Once you get the concept, you wont miss the 'up' button at all. And in my opinion, this is better than the MacOS Fidner becasue it doesn't eat up the screen. The addres bar is now a bread crumb of folders. And you can click on each one to go back, just link in a web page. And since it's anchored to a sort of 'MyComputer' view, you can go back all the way to the top. But, you can view subfolders for each bread crumb by clicking on the triangle on the right of the bread crumb. You can navigate from this list accordingly.
   
   This is elegant and fast. The 'up' button and the explorer tree were never this easy to work with, and that's the best that XP has to offer. The only thing you cannot do is drag/drop to bread crumbs. Now that would be nice.

So that's it. The new Finder rocks! It easier to work with and simplier. MS has cut out the task panes and some people will miss them, but after an adjustment I don't think most people will in the long run. The Finder's job is to navigate files, not to help you print out that lovely photo of all you favorite Battlestar Galactica characters.

Update: Some of the Task Pane like actions can now be found at the top, just below the address bar.