modifier dans une gridview en asp.net avec code

Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.Common
Partial Class ListeEmployes
    Inherits System.Web.UI.Page
    Public dbpf As DbProviderFactory
    Public oconn As DbConnection
    Public oda As DbDataAdapter
    Public cmd As DbCommand
    Public str As String = "server=HALIMA-117F0348\SQLEXPRESS;database=confection;integrated security=true"
    Public ods As DataSet
    Public dr As DbDataReader
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        dbpf = DbProviderFactories.GetFactory("System.Data.SqlClient")
        oconn = dbpf.CreateConnection
        oconn.ConnectionString = str
      
        oda = dbpf.CreateDataAdapter
        oda.SelectCommand = oconn.CreateCommand
        oda.SelectCommand.CommandText = "select * from Employe"
 
        ods = New DataSet
        oda.Fill(ods, "Employe")
        GridView1.DataSource = ods.Tables("Employe")
        GridView1.DataBind()
end sub