Question

I have a user control (Control1) which has a placeholder that may contain several additional user controls (of the same type – see below) which are added dynamically. How do I navigate the user control hierarchy to find the values of the nested sets of controls when the button located in Control 1 is clicked?

Control 1:

<%@ Control Language="C#" AutoEventWireup="True" CodeBehind="Control1.ascx.cs" Inherits="Control1" %>
<%@ Reference Control="Control2.ascx" %>

<div id="div1">
    <div id="divPh"><asp:PlaceHolder ID="phControls" runat="server" /></div>
<div id="divContinue"><asp:Button ID="btnContinue" Text="Continue" OnClick="submit_Click" runat="server" /></div>
</div>

Code behind for Control1.aspx:

protected void submit_Click(object sender, EventArgs e)
{
  // iterate through list of divControl2 controls and find out which radio button is selected
  // for example, there may be 3 divControl2's which are added to the placeHolder on Control1, rdoBth1 might be selected on 2 of the controls
  // and rdoBtn2 might be selected on 1 - how do I navigate this control structure?
}

Control 2 (Several of these may be added to the placeHolder on Control1):

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Control2.ascx.cs"     Inherits="Control2" %>
  <div id="divControl2">
      <p><strong><asp:RadioButton ID="rdoBtn1" GroupName="Group1" Checked="true" runat="server" /> Check this</strong></p>
      <p><strong><asp:RadioButton ID="rdoBtn2" GroupName="Group1" Checked="false" runat="server" /> No, check this one</strong></p>
  </div>

Answer 1

Check below code and let me know if you have any queries.

protected void submit_Click(object sender, EventArgs e)
    {
        for (int count = 0; count < phControls.Controls.Count; count++)
        {
            UserControl uc = (UserControl)(phControls.Controls[count]);
            if (uc != null)
            {
                RadioButton rdoBtn1 = new RadioButton();
                RadioButton rdoBtn2 = new RadioButton();
                rdoBtn1 = (RadioButton)(uc.FindControl("rdoBtn1"));
                rdoBtn2 = (RadioButton)(uc.FindControl("rdoBtn2"));
                if (rdoBtn1.Checked == true)
                {
                    Response.Write("1st checked ");  
                }
                else if (rdoBtn2.Checked == true)
                {
                    Response.Write("2nd checked"); 
                }

            }
        }