GridView dynamique: Impossible de récuper les nouvelles valeurs lors de l'update

J'ai crée un projet avec le cas simplifié, voici le code :

Code:

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namespace GridViewDyn
{
    public partial class _Default : System.Web.UI.Page
    {
        public int? TemplateId
        {
            get { return (int?)Session["templateId"]; }
            set { Session["templateId"] = value; }
        }
 
        protected void Page_Load(object sender, EventArgs e)
        {
           CreateForm();
        }
 
       protected override void OnInit(EventArgs e)
        {
            if (TemplateId != null && TemplateId.HasValue)
                CreateForm();
            base.OnInit(e);
        }
 
        protected void ShowGrid(object sender, EventArgs e)
        {
            TemplateId = 1;
            CreateForm();
        }
        protected GridView CreateForm()
        {
            GridView gv = CreateGridView();
            gv.RowEditing += OnRowEdit;
            gv.RowUpdating += OnRowUpdating;
            gv.DataSource = CreateDataTable();
            gv.DataBind();
 
            _Panel.Controls.Add(gv);
 
            return gv;
        }
 
        protected void OnRowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            GridView gv = sender as GridView;
 
            if (gv == null)
                return;
 
            string value = gv.Rows[e.RowIndex].Cells[1].Text; // est la valeur initiale et non la nouvelle :/
        }
 
        protected void OnRowEdit(object sender, GridViewEditEventArgs e)
        {
            ((GridView)sender).EditIndex = e.NewEditIndex;
            ((GridView)sender).DataBind();
        }
 
        protected GridView CreateGridView()
        {
            GridView gv = new GridView();
            gv.AutoGenerateColumns = false;
 
            CommandField commandColumn;
 
            commandColumn = new CommandField();
            commandColumn.ButtonType = ButtonType.Link;
            commandColumn.CausesValidation = false;//
            commandColumn.ShowEditButton = true;
            gv.Columns.Add(commandColumn);
 
            BoundField textColumn;
            textColumn = new BoundField();
            textColumn.DataField = "Value";
            textColumn.HeaderText = "Value";
            gv.Columns.Add(textColumn);
 
            return gv;
        }
        protected DataTable CreateDataTable()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("Value");
 
            int i = 1;
            DataRow row;
 
            row = dt.NewRow();
            row["Value"] = i++;
            dt.Rows.Add(row);
 
            row = dt.NewRow();
            row["Value"] = i++;
            dt.Rows.Add(row);
 
            return dt;
        }
 
 
    }
}

Code:

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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="GridViewDyn._Default" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        &nbsp;<asp:Button ID="Button1" runat="server" CausesValidation="False" OnClick="ShowGrid"
            Text="Push" />
        <asp:Panel ID="_Panel" runat="server" Height="277px" Width="312px">
        </asp:Panel>
    </div>
    </form>
</body>
</html>