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

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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.

VB

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

Posted 27-May-11 19:41pm

Mikiyas Abeb

Updated 27-May-11 22:49pm

Sandeep Mewara

v2

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Sandeep Mewara 28-May-11 4:50am

Are you sure, above code snippet has the line that throws the error? I doubt it.

Share the complete stacktrace. There must be a line number too - which line it says?

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Simon_Whale · Answer 1 · 2011-05-27T21:26:00

Solution 1

Have a check of your connection string. here is a good resource to check the string construction Connection Strings[^]

I would also verify your datasource, catalog, username and password

Posted 27-May-11 21:26pm

Simon_Whale