Dataset will not update???

[venerable bede]

I have a dataset on a winform created with the following code:
Dim objConnection As New OleDb.OleDbConnection(CONNSTRING)
Dim objOwnerDA As New OleDb.OleDbDataAdapter("Select * from tblItems", objConnection)
Dim objOwnerCB As New OleDb.OleDbCommandBuilder(objOwnerDA)
Dim objdataset As New DataSet()
objdataset.Clear()
objOwnerDA.FillSchema(objdataset, SchemaType.Source, "tblItems")
objOwnerDA.Fill(objdataset, "tblItems")
daCust.Fill(dsCust, "tblClients")

I have a button on my form which updates the dataset:
objOwnerDA.Update(objdataset, "tblItems")

For some reason the update does not reflect the changes made to the dataset on the form.
Any Ideas?

I use a combo to search for records with the following code. Could this be interfering in some way?:
Dim i As Integer, strCurrentID As String
For i = 1 To objdataset.Tables("tblItems").Rows.Count
ComboBox2.DisplayMember = objdataset.Tables("tblItems").Rows(i - 1).Item("itemDescription")
strCurrentID = objdataset.Tables("tblItems").Rows(i - 1).Item("itemDescription")
ComboBox2.Items.Add(strCurrentID)
Next
ComboBox2.SelectedIndex = 0
FillOwnerDetails()

Thanks in Advance

[ReinhardCao]

objOwnerDA needs an updatecommand to update data.

[Nucleus]

If you are using SQL server then check out the command builder object which you need to use as it creates the sql on the fly for you.