page postback?

you mean in the page_load?

when i put the method only in page_load, which i dont want to control gets added and when i add anothe one the control does not dispear but a new one doesnt get added. i thought the problem was because my i++ is not actually working. I set the i=0 in page_load() if(!this.ispostback){ i=0}

bacause ii thought when client request for a page it creates an object page then with i=0. then when user does a call back it uses this same object and uses the same i. But it seems as though it increments it from 0 -> 1 again.

heres some code. Would ther be a better way in doing what im trying to do. maybe im not understanding the concept correctly. an i do not want to call the method in page_load as I have varu\ious updatePanel on my page.

I tried -

taking everything out of the updatePanel -

like this

<table class="registrationTabel" >
                               <tr >
                                <td></td><td><asp:Label ID="Label9" runat="server" Text="Type" /></td><td><asp:Label ID="Label10" runat="server" Text="Subject Category" /></td><td><asp:Label ID="Label13" runat="server" Text="Subject" /></td><td></td>
                               </tr>
                                <tr>
                                  
                                    <td style="text-align:right;"><asp:Label ID="Label16" runat="server"  Text="Register 1:"/></td>
                                    <td><asp:DropDownList ID="DropDownList3" Width="130" runat="server" /></td>
                                    <td><asp:DropDownList Width="130" ID="DropDownList4" runat="server" /></td>
                                    <td><asp:DropDownList Width="130" ID="DropDownList5" runat="server" /></td>
                                    <td><asp:ImageButton ID="ImageButton2" OnClick="addASubjectType_Click" runat="server" /></td>
                                </tr>
                                   <asp:PlaceHolder runat="server" ID="PlaceHolder1"  >
                                   
                                   
                                   </asp:PlaceHolder>
                               
                            </table>

Now it adds the whilst running the method below to add content to panel. But doing this adds the first time u click button. the second button i click wants to validate the form.

-I have RequiredFieldValidator. but i set the validation group for them to "a". because they conflicted with my buttons before.

Therefore in the code below i set the validation group to "b". when i do not initialise this it still tries to validate the formjust as if i would not initialise it. so btn.validationgroup doesnt seem to be initialising.

All of this code is in a big registration form

I would like to know how i would get the newly created code by my addRowToPanel to panel methods. retrieve their vali\ues in c#

ControlCollection controls = Page.Controls

?

would that work. im not there yet, but i just want to know when i get there how i would do it.

protected void Page_Load(object sender, EventArgs e)
        {
            
            datareturner = new DataReturner();

            if (!this.IsPostBack)
            {
                i = 0;
            }
            else {
               addRowToPanel();
            }

 private void addRowToPanel()
        {
            i++;

            Label label = new Label();
            label.ID = "RegisterLabel" + i;
            label.Text = "Register " + i + ": ";
            DropDownList addDropListType = new DropDownList();

            DropDownList addDropListSubjectCategory = new DropDownList();

            DropDownList addDropListSubject = new DropDownList();
            ImageButton imageBtn = new ImageButton();


            imageBtn.ID = "addTypeSubject" + i;
            imageBtn.Click += new ImageClickEventHandler(addASubjectType_Click);




            imageBtn.ValidationGroup = "b";

            myPlaceHolder.Controls.Add(new LiteralControl("<tr>"));
            myPlaceHolder.Controls.Add(new LiteralControl("<td>"));
            myPlaceHolder.Controls.Add(label);
            myPlaceHolder.Controls.Add(new LiteralControl("</td>"));
            myPlaceHolder.Controls.Add(new LiteralControl("<td>"));
            myPlaceHolder.Controls.Add(addDropListType);
            myPlaceHolder.Controls.Add(new LiteralControl("</td>"));
            myPlaceHolder.Controls.Add(new LiteralControl("<td>"));
            myPlaceHolder.Controls.Add(addDropListSubjectCategory);
            myPlaceHolder.Controls.Add(new LiteralControl("</td>"));
            myPlaceHolder.Controls.Add(new LiteralControl("<td>"));
            myPlaceHolder.Controls.Add(addDropListSubject);
            myPlaceHolder.Controls.Add(new LiteralControl("</td>"));
            myPlaceHolder.Controls.Add(new LiteralControl("<td>"));
            myPlaceHolder.Controls.Add(imageBtn);
            myPlaceHolder.Controls.Add(new LiteralControl("</td>"));
            myPlaceHolder.Controls.Add(new LiteralControl("</tr>"));


            AsyncPostBackTrigger a = new AsyncPostBackTrigger();
            a.ControlID = imageBtn.ID;
            a.EventName = "Click";

            UpdatePanelSubjectType.Triggers.Add(a);

            // ImageButton1.Click -= new ImageClickEventHandler(addASubjectType_Click);
            ImageButton1.Enabled = false;
            //  ImageButton1.Visible = false;
            //addDropList.ID = ""

        
        }

Thanx your help is greatly appreciated