Question

Can anybody explain to me why the following sub on the development machine runs smoothly, but when I deploy and install on another pc I get an error.

The Error I get is “Couldnt show any because: Object reference not set to an instance of an object”

While on the development machine it works.
Both running Win7, I inclluded all sql files as stated on the deployment instruction for datafile and sql-ce dll’s from the msdn.

The datafile is fine and connection is good, becuase a “cmd.ExecuteNonQuery()” runs without problems.

Public Sub LoadFolders()
    Dim ds As New DataSet
    Dim da As SqlCeDataAdapter = New SqlCeDataAdapter()
    Dim cmd As SqlCeCommand



    Try
        cmd = New SqlCeCommand("SELECT distinct(folder) from addressbook", connection.DbPrivate)
        cmd.CommandType = Data.CommandType.Text
    Catch e As Exception
        Console.WriteLine("Could not execute sql: {0}", e.Message)
    End Try



    Try
        With da
            .SelectCommand = cmd
            .Fill(ds, "folders")
        End With

    Catch e As Exception
        Console.WriteLine("Unable to fill dataset: {0}", e.Message)
    End Try

    Try
        For Each irow As DataRow In ds.Tables("folders").Rows
            MsgBox(irow(0))
        Next
    Catch e As Exception
        MsgBox("Couldnt show any because: " + e.Message) 'this is the error that pops up.
    End Try


End Sub

Answer 1

I think your problem might be in the connection string, make sure it is right and then check if you had included any references that they are included on the other pc.