Visual Studio :: Error Controls In Desing View - Unable To Add New Controls In Webapplication?

Mar 4, 2011

I start coding a webform and when I save and close VS and open again the proyect this happens to all the controls in desing view:

This is the code within the controls, I guess It's something to do with data controls and I'm hardly search about this error but not able to find any answer.What the message error says on English: "An error has ocurred when the control was created" "Objet Reference not established as an object instance" (more or less It was it says)

Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.UI.Control [code]...

Note: Servers names and databases were modified for security issues, :p

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