Get HiddenField value from ASP.Net GridView using C#

Heklo there.

I can't get a hidden field value from a gridview using c# and asp.net

I don't have error but the value of the hidden field is not sent and validated in GridView1_RowDataBound.

My code below, can you help me?

<asp:TemplateField
    HeaderText="S"
    ItemStyle-CssClass="ddl_Class_new"
    ItemStyle-HorizontalAlign="Center">
    <ItemTemplate>
        <asp:ImageButton ID="ImageButton2" runat="server"
            ImageUrl='<%#(Eval("S").ToString().Contains("OK") ? "/aspnet/img/bullett/forestbul.gif" : "/aspnet/img/bullett/redbul.gif")%>'
            ToolTip='<%#(Eval("S").ToString().Contains("OK") ? "OK" : "KO")%>'
            Enabled="false" />
        <asp:HiddenField ID="hddblink" runat="server" Value='<%#Eval("S")%>' />
    </ItemTemplate>
</asp:TemplateField>
 
 
<asp:TemplateField ItemStyle-HorizontalAlign="Center">
    <HeaderTemplate>
        <asp:CheckBox ID="chkBxHeader"
            AutoPostBack="true" OnCheckedChanged="chkBxHeader_CheckedChanged" runat="server" />
    </HeaderTemplate>
    <ItemTemplate>
        <div>
            <asp:CheckBox ID="chkRow" runat="server" Enabled="false" />
        </div>
    </ItemTemplate>
</asp:TemplateField>

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    try
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            HiddenField BlinkTask = e.Row.FindControl("hddblink") as HiddenField;
            CheckBox cbTrue = (CheckBox)e.Row.FindControl("chkRow");
 
            string S = BlinkTask.Value.ToString();
 
            if (S.ToString() == "OK")
            {
                cbTrue.Checked = true;
            }
            else
            {
                cbTrue.Checked = false;
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine("Skipped exception! " + ex);
    }
}