get event of user contol on aspx page

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ASP.NET

Can anyone tell me how i can get button event of user control at host page.my code is here.I create a ascx class name SearchUserControl

  private DataTable dtsearch;
  public DataTable SearchBindFullDetail
  {
      get;set;
  }
public event EventHandler ButtonClickDemo;  // Event declaration
 protected void btnSearch_Click(object sender, EventArgs e)
 {
     if (ButtonClickDemo != null)
     {
         ButtonClickDemo(sender, e);
     }
     else
     {
         if (rbtnSearch.SelectedIndex == 0)
         {
         }
         else if (rbtnSearch.SelectedIndex == 1)
         {
             SearchUserControl srch = new SearchUserControl();
             srch.SearchBindFullDetail = admsz.SelAllDetlByMembrshipNoBal(txtMemberShipNo.Text);
         }
         else
         {
             lblMsz.Text = "Please select option for search.";
         }
     }

aspx page....

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit.HTMLEditor" TagPrefix="cc1" %>
<UserInformation:SearchUserControl id="UserInformation"   runat="server"/>  

aspx.cs page..

protected void Page_Load(object sender, EventArgs e)
   {
       if (!IsPostBack)
       {

           UserInformation.ButtonClickDemo += new EventHandler(UserInformation_ButtonClickDemo);

       }
   }
 protected void UserInformation_ButtonClickDemo(object sender, EventArgs e)
   {
       //  Put your search logic in here using myUserControl.SearchCriteria



   }