ASP.NET - dynamic updatepanel and dropdownlistbox

please, I'm not getting success with upadatepanel and dropdownlistbox in dynamic mode....
the postback is not running...


can someone help me, please ?


the code is bellow:
 
              foreach (DataRow askAsk in usr.GetDataByName(txtFindFriendName.Text.ToString()).Rows)
                    {


                        UpdatePanel upFriend = new UpdatePanel();
                        upFriend.ID = "upFriend" + askAsk.ItemArray[0].ToString();
                        upFriend.ChildrenAsTriggers = false;
                        upFriend.UpdateMode = UpdatePanelUpdateMode.Conditional;
                        upFriend.RenderMode = UpdatePanelRenderMode.Block;
 
                        ImageButton imgFindFriendUsrMail = new ImageButton();
                        imgFindFriendUsrMail.ID = "imgFindFriendUsrMail" + askAsk.ItemArray[0].ToString();
                        if (askAsk["foto"].ToString().Length > 0)
                            imgFindFriendUsrMail.ImageUrl = "fig/usrs/" + askAsk["foto"].ToString();
                        else
                            imgFindFriendUsrMail.ImageUrl = "fig/ling/noPhoto.jpg";
                        imgFindFriendUsrMail.OnClientClick = "javascript:return false;";
                        imgFindFriendUsrMail.Width = 150;
                        imgFindFriendUsrMail.Height = 100;




                        upFriend.ContentTemplateContainer.Controls.Add(imgFindFriendUsrMail);
                        upFriend.ContentTemplateContainer.Controls.Add(new LiteralControl("<br />"));


                        Label lblFindFriendUsrName = new Label();
                        lblFindFriendUsrName.ID = "lblFindFriendUsrName" + askAsk["idUSer"].ToString();
                        lblFindFriendUsrName.Text = askAsk["name"].ToString();
                        lblFindFriendUsrName.CssClass = "lblFindFriendUsrName";






                        upFriend.ContentTemplateContainer.Controls.Add(lblFindFriendUsrName);




                        DropDownList ddFindFriendAction = new DropDownList();
                        ddFindFriendAction.ID = "ddFindFriendAction" + askAsk["idUSer"].ToString();
                        ddFindFriendAction.CssClass = "ddFindFriendAction";
                        ddFindFriendAction.AutoPostBack = true;
                        ddFindFriendAction.SelectedIndexChanged += new EventHandler(ddFindFriendAction_SelectedIndexChanged);


                        ListItem chooseAsk0 = new ListItem();
               chooseAsk0.Text = "escolha uma opção";
                        chooseAsk0.Value = "0";
                        ddFindFriendAction.Items.Add(chooseAsk0);
 
                        upFriend.ContentTemplateContainer.Controls.Add(ddFindFriendAction);
                        upFriend.ContentTemplateContainer.Controls.Add(new LiteralControl("<br />"));
 
                        AsyncPostBackTrigger trigger = new AsyncPostBackTrigger();
                        trigger.ControlID = "ddFindFriendAction" + askAsk["idUSer"].ToString();
  trigger.EventName = "SelectedIndexChanged";
       
                
                        upFriend.Triggers.Add(trigger);


                        upFriend.Update();
                        PlaceHolder1.Controls.Add(upFriend);
                    }
 

Concentrate on these lines-

DropDownList ddFindFriendAction = new DropDownList();
                        ddFindFriendAction.ID = "ddFindFriendAction" + askAsk["idUSer"].ToString();
                        ddFindFriendAction.CssClass = "ddFindFriendAction";
                        ddFindFriendAction.AutoPostBack = true;

                        ddFindFriendAction.SelectedIndexChanged += new EventHandler(ddFindFriendAction_SelectedIndexChanged);    //Put a break point also here and debug your code

Here you are binding ddFindFriendAction_SelectedIndexChanged() method to event , but Have you create any method by name ddFindFriendAction_SelectedIndexChanged() in your code.

Hello,

You need to Override OnLoad Event for Added Dynemic Update Panel.

Added Update Panel Dynemic on OnLoad Event.

OverRide OnLoad Event as following way

Declare DropDownList and assign to Update Panel as following way

 

DropDownList ddFindFriendAction;

protected override void OnLoad(EventArgs e)

{

foreach (DataRow askAsk in usr.GetDataByName(txtFindFriendName.Text.ToString()).Rows)

      {

ddFindFriendAction = new DropDownList();

        ddFindFriendAction.ID = "ddFindFriendAction" + askAsk["idUSer"].ToString();

        ddFindFriendAction.CssClass = "ddFindFriendAction";

        ddFindFriendAction.AutoPostBack = true;

        ddFindFriendAction.SelectedIndexChanged += new EventHandler(ddFindFriendAction_SelectedIndexChanged);

 

      }

}

void ddFindFriendAction_SelectedIndexChanged(object sender, EventArgs e)

    {

      string a = ddFindFriendAction.SelectedValue;

    

    }

 

Hope this helpful!

Thanks

 

 

 

thanks a lot, R.B. and sorry about my poor english


but


doesnt work here....



two things :


the code is inside

    protected void lkFinfFriendClick_Click(object sender, EventArgs e)
    {




ps: the dropdown gives a asyncpostback, but doesnt run my code, and in the second dropdownIndexChanged, the page gets a refresh....





thank you again

Move this piece of code to the Init event.