Saving new record to dataset and then comitting changes to database

I am trying to save a newly inserted row in the dataset and commit the changes back to the database in a vb.net windows project.    I am creating the dataset when the form loads and then adding a row to that dataset when i execute the save code i created.  Below is how i am creating the dataset:

Public Class frmMainForm

    Dim BOL_DS As New DataSet  <-----declaring the dataset

    Private Sub frmMainForm_Load..........        
         Dim sSQL As String = "SELECT * FROM tblInfo"
         Dim cn As New SqlConnection(My.Settings.dbConnectionString)
         Dim da As New SqlDataAdapter(cn.CreateCommand)

         If cn.State = ConnectionState.Closed Then
             cn.Open()
         End If

         da.SelectCommand.CommandText = sSQL
         da.Fill(BOL_DS)
   End Sub

Then when i want to save the data to the dataset i am doing the following:

         Dim dr As DataRow
        dr = BOL_DS.Tables(0).NewRow

        dr("Rec_ID") = Me.Rec_ID.Text
        dr("Date") = Me.Todays_Date.Text

        BOL_DS.Tables(0).Rows.Add(dr)

I then commit the changes to the database as follows:

        Dim sSQL As String = "SELECT * FROM tblInfo"

        Dim cn As New SqlConnection(My.Settings.dbConnectionString)
        Dim da As New SqlDataAdapter(sSQL, cn)

        Dim cb As New SqlCommandBuilder(da)

        'update dataset
        da.Update(BOL_DS)

When I execute all of this code it all seems to work (no errors are thrown) but nothing gets saved back to the database.   I am hoping somebody can shed some light on what is happening and what i am doing wrong.   I am using vb.net & SQL server 2005.

Thanks