data binding with controls in code

Hi

I'm using ADO.NET to work with my database. In form_load procedure, after connecting and loading data in data set, and after setting CurrencyManager, I'm setting data binding for my 2 text boxes:

txtFName.DataBindings.Add("Text", data_set.Tables("People"), "f_name")

txtLName.DataBindings.Add("Text", data_set.Tables("People"), "l_name")

This all works fine, when I start my app I get the right data in my 2 text boxes. But, when I hit "move next" button the data in text boxes does not change.

The code behind move next button is simple:
cur_man.Position += 1

Where is the problem ?

Thanks.

Complete code listing:

Private data_set As New DataSet()
Private daPeople As Data.OleDb.OleDbDataAdapter
Public Conn_s As String
Private WithEvents Cur_Man As CurrencyManager

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Conn_s = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\people.mdb"

daPeople = New Data.OleDb.OleDbDataAdapter("select * from people", Conn_s)
daPeople.TableMappings.Add("Table", "People")
daPeople.Fill(data_set)
Cur_Man = Me.BindingContext(data_set, "People")

txtFName.DataBindings.Add("Text", data_set.Tables("People"), "f_name")
txtLName.DataBindings.Add("Text", data_set.Tables("People"), "l_name")

End Sub

Private Sub btnNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNext.Click

Cur_Man.Position += 1

End Sub