Instead of hardcoding the postback method name in your page script, I'd recommend you use the GetPostBackEventReference() method off the Page class. This will return you the generated method name and will most likely be forward compatible. It also handles the issue of ensuring that the client-side method is emitted to the page markup.
http://msdn.microsoft.com/library/en...rencetopic.asp
ASP.NET 2.0 has a feature call "client call-backs" which perform exactly what you are looking for. They can be activated within the 2.0 GridView control (similar to DataGrid) so that the body of the grid is redrawn without the need for a full page postback.
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Peter