An unhandled exception of type 'System.NullReferenceException' occurred in System.data.dll

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VB

Hi all,

I am using vb.net 2003 and Sql 2000 server when I am trying to connect to sql server it generates error.
it says "An unhandled exception of type 'System.NullReferenceException' occurred in System.data.dll"

Here is the code. Please help me.

Private Sub ConnectToSQL()
       Dim con As New SqlConnection
       Dim cmd As New SqlCommand
       con.ConnectionString = "Data Source=(local);Initial Catalog=AACA_Library_db;Persist Security Info=True;User ID=lib;Password=lib"
       con.Open()
   End Sub

Thank you in advance