各位大侠，这是我编的一段代码，如何将新表table1放在容器PlaceHolder1中，谢谢！

using System;
using System.Collections;
using System.ComponentModel;
//*******
public class ** : PageBase
 {
  protected System.Web.UI.WebControls.PlaceHolder PlaceHolder1;
  protected System.Web.UI.WebControls.PlaceHolder PlaceHolder2;
//******初定义

  
 
  private void Page_Load(object sender, System.EventArgs e)
  {
   if (Session[***]==null)
   {
    Response.Redirect(UrlBase + "/error.aspx");
   }
   **   //
   // Now validate the user info
   //
   SecureSystem user = new SecureSystem(CurrentUser);
   if ( user.Validate(***)) )
   {
    // validate ok
   }
   else
   {
    Response.Redirect( UrlBase + "/secure/logon.aspx" );
   }

   if (!IsPostBack)
   {
    data = (new **view()).Load**view(**);
    table1 = table2 = null;这样???
    
    GenerateTable****();
    
    GenerateTable***();
    
    PlaceHolder1.Controls.Add(table1);
   }
  }
//下面是对table1和table2的一些定义