"Failed to add validation event handler because the following error..."

Failed to add validation event handler because the following error:
El indice no es valido. (Exception from HRESULT: 0x8002000B (DISP_E_BADINDEX)

While double clicking on column.
Editor shows this:

namespace HolaMundo1 { partial class Database1DataSet { partial class CLIENTESDataTable { } } }

Windows XP sp2 in spanish.
Visual C# Express 2005
SQL Server Express 2005

Some idea what can I do
It seems a bad DLL / OCX / assembly but have no clue what can I do.

Regards.

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"Failed to add validation event handler because the following error..."

reZer
Follow up:

I try in VB and it worked.
Could be some bad component in C#

Regards.
jswilson
Just to keep alive the post because it seems to be a bug...
yennisse
Follow up:

I install C# on my home's desktop but have the same problem.

Regards.
BaNgInG
Follow up:

I open the error window and found this:

Message 1 Could not find schema information for the element 'urn:schemas-microsoft-com:xml-msdatasource-layout:DiagramLayout'. C:\Documents and Settings\ssamayoa\Configuracion local\Datos de programa\Temporary Projects\HolaMundo1\Database1DataSet.xss 7 2 HolaMundo1

and other errors caused obviusly by this.

Please help!
sp_412000
Just to keep alive the post because it seems to be a bug...
Fab IT

Just to keep alive the post because it seems to be a bug...
Hayder Marzouk
Just to keep alive the post because it seems to be a bug...
Aaron Steers
Hello, I think you should have a look at the following thread:

http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=206596&SiteID=1

I think it's the same or a similar problem. Two people from Microsoft have posted responses there and acknowledged a bug in Visual C# 2005 Express Edition.
"Failed to add validation event handler because the following error..."

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