data view

In my project, I have a ComboBox and a DataGrid.
On the Load of the Form, I put this code;

OleDbDataAdapter1.Fill(DataSet11, "students")
Dim dv As DataView
dv = DataSet11.Tables("students").DefaultView
MessageBox.Show(dv.Count)
DataGrid1.DataSource = dv

'to combo
Dim a As Integer
For a = 1 To dv.Count
ComboBox1.Items.Add(dv.Item(0))
Next

My first problem is in the ComboBox, How can I add all the Student No to ComboBox?
I tried the code above but doesn't work. Please help me with this?

And my second question is, how can I go to Next or Previous record and how to delete records?

You have to read a little more about data binding with windows forms.
For a start look here.
ms-help://MS.VSCC.2003/MS.MSDNQTR.2003APR.1033/dndotnet/html/databindingadonet.htm