how to synchronize Between two pages in ASP.NET

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C#2.0

C#

Hello Friends ,

Scenario :-

display.aspx.cs

  protected void onClick_ShowData(object sender,EventArgs e)
  {
//calling the class which is defined below 
   Report RP = new Report(10,20); 
   mygrid.datasource = RP;
   mygrid.databind();
  }

=>In this page i have an percentile progress bar(progressbar1) ,which i want to update as per execution of functions call through Report.cs class which is present in another class library project.

Class Report
{
  // Default constructor 
  public Report()
  {
  }
  //parameterized constructor
     public Report(int para1,int para2)
    {
     function1();
     function2();
    }
   public void function1()
   {
    //here i want to update progressbar1 to 10% which is present in display.aspx 
   //Some logical code
    //here i want to update progressbar1 to 50% which is present in display.aspx 
   }
   public void function2()
  {
    //here i want to update progressbar1 to 60% which is present in display.aspx 
  //Some logical code
  //Initialize some properties
   //here i want to update progressbar1 to 80% which is present in display.aspx 
   function3();
  }
  public void  function3()
  {
    //here i want to update progressbar1 to 90% which is present in display.aspx 
   // Some more data fetch from DB  
    //here i want to update progressbar1 to 100% which is present in display.aspx 
  }
}

Problem : So my problem is how i can synchronize between an class and an progress bar which is present in another UI page(display.aspx.cs) .

[edit]SHOUTING removed - OriginalGriff[/edit]