Excel Add-in VB.net Problem connecting to SQL

Hi. I am getting the error trying to connect to a SQL database from my VB.net Excel add-in.
This error hasn't come up in two years and has suddenly arisen after I installed Office 2013 alongside  my existing Office 2007. The error happens at the fourth line of the following code:


            Dim cn As New SqlConnection(oConnectionString)

            Dim adp As New SqlDataAdapter(SQLExpression, cn)

            Dim ds As New DataSet

            adp.Fill(ds, "SystemData") 'Error at this line

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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
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Valliappan ANConnect With a Mentor Senior Tech ConsultantCommented:
Also check this link:

http://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/SQL-Server-2005/Q_23725734.html

You may need to set priorities, or Named Pipes.
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Valliappan ANSenior Tech ConsultantCommented:
Is the TCP/IP protocol enabled in your SQL Server?

Check this link: http://sqlanddotnetdevelopment.blogspot.in/2013/07/a-connection-was-successfully.html

Hope that helps.
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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Thanks for your help
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