Using Web.config ConnectionStrings And SQL Server

Greetings,

My connection string looks like this (in the web.config) and is used with many data controls in my application:

<connectionStrings>
<add name="connection_NAH" connectionString="Data Source=NAH;Initial Catalog=NAH;User ID=xxxx;Password=xxxx" providerName="System.Data.SqlClient" />
</connectionStrings>

I'm using vb.net and my code looks like this:

Dim myConnection As SqlConnection
Dim mySqlCommand As SqlCommand

myConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("connection_NAH").ConnectionString)

mySqlCommand = New SqlCommand("UPDATE tbMasterOption SET ImageURL = 'test.gif' WHERE ID = 116977")

Try
            myConnection.Open()
            mySqlCommand.ExecuteNonQuery()
Catch ex As Exception
            Label3.Text = "Couldn't update database record: " + ex.ToString()
Finally
            myConnection.Close()
            Label3.Text = "Closed db connection"
End Try

------------------

The only output I get is from the label3 which says "Closed db connection".  Doesn't look like any exceptions are thrown but when I look at the database the record is not updated.  Originally I thought my SQLConnection was not constructed correctly but I also tested it by outputting the connection string to Label3 which looked fine.  The only other thing I can think of is in the use of ExecuteNonQuery().  Is this the right method or do I need something else? Running the sql query manually works...

Thanks in advance..