Visual Studio 2008 w/Sp1
To reproduce my problem I simply create a new .Net 2.0 web application and add a page with the following markup:
<%@ Page Language='C#' AutoEventWireup='true' CodeBehind='Default.aspx.cs' Inherits='WebApplication5._Default' %> <!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'> <html xmlns='http://www.w3.org/1999/xhtml' > <head runat='server'> <title></title> </head> <body> <form id='form1' runat='server'> <div> <asp:button id='button1' runat='server' /> </div> </form> </body> </html> what happens is that a line is drawn under :button with the statement ‘Validation (): Element ‘button’ is not supported.’
I’ve tried repairing the .net framework; however, that had no impact. This started happening on two different machines, one is vista the other is XP within the past week.
UPDATE: I closed this question because after spending 2 days trying to fix it I gave up and performed a complete reinstall of Visual Studio 2008. This resolved whatever was jacked up and now the machines in question work properly. I upvoted each of you for the help.
Since this is the standard page that visual studio creates, except that you’ve added a button. We can rule out that there is anything wrong with the code.
I would start with what you said about ‘repairing the .NET framework’. What was broken to begin with? Maybe your repair didn’t fix the issue you had.
So from there, I would then examine what was recently installed on your computers.
I would then examine the web.config file to make sure it is referencing all the correct assemblies.
if you can provide anymore info that would help lots.