not sure though what you're talking about, but might this help.
Code:
 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        da.SelectCommand = New SqlCommand("select * from Student", cn)
        ds.Tables.Add(New DataTable("Table1"))
        da.Fill(ds.Tables(0))
    End Sub

    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim arrRow() As DataRow
        arrRow = ds.Tables(0).Select("Idno = 3")
        TextBox1.Text = arrRow(0)(1).ToString
    End Sub
if i misleading you sorry for that, but try to explain more details on what your trying to do.