Hi Bruno,
Besides learning ASP.NET 2.0, you may want to pick up a book about SQL Server if your web site requires database access (most web sites do).
Beginning SQL Server Programming (
http://www.wrox.com/WileyCDA/WroxTit...764584332.html) might be a good choice but it won't be out until February 2006. From the same author, there is Professional SQL Server Programming (
http://www.wrox.com/WileyCDA/WroxTit...764543792.html), which is a great book, targeting SQL Server 2000.
Depending on how "HTML" your previous sites were, you may also need to understand a bit more about JavaScript and CSS.
With dynamic web sites, a good understanding of client server technology would be useful as well.
Regarding your error: did you add that line before anything else? That is, even before stuff like a doc type? Can you post the source code for the page?
Cheers,
Imar
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Imar Spaanjaars
Everyone is unique, except for me.