Event Bubling with C#

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C#

ASP.NET

hi friends please help me
i am using asp.net 3.5 and using i took a web project
i have a class which is UserControlEventArgs.cs which is

using System;

/// <summary>
/// Jeff Kent - 11/14/2009
/// EVENT CLASS THAT ENCAPSULATES THE EVENT ARGUMENTS.
/// </summary>
public class UserControlEventArgs : EventArgs
{

  //CONSTRUCTOR USED TO DETERMINE IF A
  //RECORD INSERTION WAS SUCCESSFUL.
  public UserControlEventArgs(bool InsertComplete)
  {
    if (InsertComplete)
    {
      this.InsertComplete = true;
    }
    else
    {
      this.InsertComplete = false;
    }
  }

  private bool _InsertComplete;
  public bool InsertComplete{
    get { return _InsertComplete ; }
    set { _InsertComplete = value; }
  }

}

//DECLARE THE EVENT DELEGATE FOR THE CONTROL.
//NOTE HOW THE DELEGATE RESIDES OUTSIDE THE SCOPE OF THE CLASS.
public delegate void ClubInsertedEventHandler(object sender, UserControlEventArgs e);

And one web user control is WebUserControlAddUser.ascx

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

/// <summary>
/// Jeff Kent - 11/14/2009
/// SAMPLE WEB USER CONTROL WITH EVENT BUBBLING SUPPORT.
/// THE FORM VIEW CONTROL IS USED TO COLLECT AND PROCESS CLUB INFORMATION.
/// ONLY THE INSERT ITEM TEMPLATE IS USED IN THIS EXAMPLE.
/// </summary>
public partial class WebUserControlAddUser : System.Web.UI.UserControl
{

  //DECLARE THE DELEGATE VARIABLE.
  public event ClubInsertedEventHandler ClubInsertComplete;

  //PUT THE FORM VIEW INTO THE INSERT MODE 
  //EVERY TIME THE PAGE LOADS THE CONTROL.
  protected void FormView1_Load(object sender, EventArgs e)
  {
    FormView1.ChangeMode(FormViewMode.Insert);
  }

  // THE FORM VIEW CONTROL CAN BE TRICKY. 
  // THE WORK AROUND THE QUIRKS IS TO INTERCEPT THE ITEMCOMMAND EVENT
  // THEN USE THE SWITCH STRUCTURE TO CONTROL THE STATE OF THE CONTROL.
  protected void FormView1_ItemCommand(object sender, FormViewCommandEventArgs e)
  {
      UserControlEventArgs args;
      switch (e.CommandName)
      {
        case "StartInsert":
          //NOT USED IN THIS IMPLEMENTATION.
          break;
        case "CommitInsert":
          InsertNewClub();
          FormView1.ChangeMode(FormViewMode.ReadOnly);

          //FIRE THE EVENT TO SEND NOTICE TO
          //THAT THE CLUB SUBBMISSION WAS SUCCESSFUL.
          args = new UserControlEventArgs(true);
          ClubInsertComplete(this, args);

          break;
        case "CancelInsert":
          FormView1.ChangeMode(FormViewMode.ReadOnly);
          FormView1.DataBind();

          //FIRE THE EVENT TO SEND NOTICE TO
          //THAT THE CLUB SUBBMISSION WAS CANCELLED.
          args = new UserControlEventArgs(false);
          ClubInsertComplete(this, args);

          break;
        default:
          break;
    }
  }

  //OBTAIN THE DATA FROM THE FORM 
  //AND INSERT IT INTO THE DATA TABLE.
  protected void InsertNewClub()
  {
    TextBox tb;

    tb = (TextBox)FormView1.FindControl("ClubID");
    int ClubID = Convert.ToInt32(tb.Text);
    tb = (TextBox)FormView1.FindControl("ClubName");
    string ClubName = tb.Text;
    tb = (TextBox)FormView1.FindControl("URL");
    string url = tb.Text;

    ClubList.AddClub(ClubID, ClubName, url);
  }
}

i am confused about assembly reference ."you are missing a using directive or an assembly reference"
why the error comes when i run the program

i have made that line bold please check