How can I populate an editable Grid with data from different tables from MSSQL Server'05 writing a code behind function???

I have used:

    Dim conn As New SqlConnection(conn_web)
    Dim objCmd As New SqlDataAdapter(sql, conn)
    Dim oDS As New DataSet

    objCmd.Fill(oDS, "TAB")

    Dim dt As DataTable = oDS.Tables(0)
    Dim rowCount As Integer = dt.Rows.Count
    Dim dr As DataRow = dt.NewRow()
    If rowCount = 0 Then
        e.DataSource = Nothing
        e.DataBind()
        e.Focus()

    Else
        e.DataSource = dt
        e.DataBind()
    End If