title: Processing events on Dynamically Loaded User Controls
body: <p>I have a number of pages that I need to Dynamically Load User Controls and process events on controls on them. I have included sample code below for a trivial example.</p>
  
  <p>Default.aspx</p>
  
  <pre><code>&lt;%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %&gt;
  
  &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
  
  &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
  &lt;head runat="server"&gt;
      &lt;title&gt;&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
      &lt;form id="form1" runat="server"&gt;
      &lt;div&gt;
      &lt;asp:Button ID="BtnLoadControl" runat="server" Text="Load Control 1" 
              onclick="BtnLoadControl_Click" /&gt;&lt;br /&gt;
      &lt;asp:Button ID="BntLoadControl2" runat="server" Text="Load Control 2" 
              onclick="BntLoadControl2_Click" /&gt;
      &lt;asp:PlaceHolder ID="ControlArea" runat="server" /&gt;
      &lt;/div&gt;
      &lt;/form&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Deafualt.aspx.cs</p>
  
  <pre><code>    using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  
  public partial class _Default : System.Web.UI.Page 
  {
      protected void Page_Load(object sender, EventArgs e)
      {
  
      }
      protected void BtnLoadControl_Click(object sender, EventArgs e)
      {
          Control controlToAdd = Page.LoadControl("~/control1.ascx");
          this.ControlArea.Controls.Add(controlToAdd);
      }
      protected void BntLoadControl2_Click(object sender, EventArgs e)
      {
          Control controlToAdd = Page.LoadControl("~/control2.ascx");
          this.ControlArea.Controls.Add(controlToAdd);
      }
  }
  </code></pre>
  
  <p>Control1.ascx</p>
  
  <pre><code>&lt;%@ Control Language="C#" AutoEventWireup="true" CodeFile="control1.ascx.cs" Inherits="control1" %&gt;
  &lt;div style="border: 1px solid red;"&gt;Test Control
  &lt;br /&gt;&lt;asp:Button runat="server" ID="testButton" Text="test" onclick="testButton_Click" /&gt;&lt;/div&gt;
  </code></pre>
  
  <p>Control1.ascx.cs</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  
  public partial class control1 : System.Web.UI.UserControl
  {
      protected void Page_Load(object sender, EventArgs e)
      {
  
      }
  
      protected void testButton_Click(object sender, EventArgs e)
      {
          Response.Write("Button Clicked on Control 1!");
      }
  }
  </code></pre>
  
  <p>Control2.ascx</p>
  
  <pre><code>&lt;%@ Control Language="C#" AutoEventWireup="true" CodeFile="Control2.ascx.cs" Inherits="Control2" %&gt;
  &lt;div style="border: 1px solid red;"&gt;Test Control 2
  &lt;br /&gt;&lt;asp:Button runat="server" ID="testButton2" Text="test me" 
          onclick="testButton2_Click"  /&gt;&lt;/div&gt;
  </code></pre>
  
  <p>Control2.ascx.cs</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  
  public partial class Control2 : System.Web.UI.UserControl
  {
      protected void Page_Load(object sender, EventArgs e)
      {
  
      }
      protected void testButton2_Click(object sender, EventArgs e)
      {
          Response.Write("Button Clicked on Control 2!");
      }
  }
  </code></pre>
  
  <p>This is a very trivial example to show what I would like to do. My actual control is more complex and has <strong>several properties that I set for the control I load</strong> as I load it (in the default.aspx.cs files event handler).</p>
  
  <p>With this example what happens is when the button is clicked on one of the loaded controls, the page is re-loaded and the control is no longer there. How can I keep the control loaded as well as process any events that happen on the control?</p>