Problem with page lifecycle

The qustion was modified by me to show a complete picture.

I have a basic question:

code behind:

protected void Page_Load(object sender, EventArgs e)
{
     int firstPageIndex = 0;
     int lastPageIndex = 5;


    if (TotalPageNumber > 5)
    {
          if ((TotalPageNumber - PageIndex) <= 5)
            firstPageIndex = TotalPageNumber - 5;

        firstPageIndex = PageIndex < 3 ? 0 : PageIndex - 2;
    }
    else
    {
        firstPageIndex = 0;
        lastPageIndex = TotalPageNumber;
    }


    for (int i = firstPageIndex; i < firstPageIndex + lastPageIndex; i++)
    {
        LinkButton lnk = new LinkButton();
        lnk.CommandArgument = i.ToString();
        lnk.Click += new EventHandler(lblPageNumber_Click);
        lnk.ID = "lnkPage" + (i + 1).ToString();
        lnk.Text = (i + 1).ToString();
        plcPagerHolder.Controls.Add(lnk);
    }    }

  int _pageIndex;
  public int PageIndex
  {
      get
      {
          object objPage = ViewState["_pageIndex"];

          if (objPage 开发者_运维知识库== null)
          {
              _pageIndex = 0;
          }
          else
          {
              _pageIndex = (int)objPage;
          }

          return _pageIndex;
      }
      set {ViewState["_pageIndex"] = value; }
  }



   protected void lnkPagerNext_Click(object sender, EventArgs e)
{
    PageIndex = PageIndex == TotalPageNumber - 1 ? 0 : PageIndex + 1;
  }

The problem is with Page_Load event, I expect to get new PageIndex after the linkbutton is clicked.

Update:

My Foo adds new controls to the page, based on provide Page index so I guess I can't put it in Prerender.

Two options

  protected void Page_Load(object sender, EventArgs e)
  {
     if (!Page.IsPostBack)
     {
         Foo (PageIndex);    
     }
  }

  protected void LinkButton_Click(object sender, EventArgs e)
  {                
      PageIndex = int.Parse(((LinkButton)sender).CommandArgument);
      Foo (PageIndex);  
  }

or

  protected void Page_PreRender(object sender, EventArgs e)
  {                
      Foo (PageIndex);  
  }

you can place Foo (PageIndex) in Page_LoadComplete event instead of Page_Load, i.e.

protected void Page_LoadComplete(object sender, EventArgs e) 
{ 
    Foo (PageIndex);     
} 

LoadComplete event is raised after Control events.

Edit: LoadComplete is the earliest place where you can safely access new pageindex and also you can add there another controls, but that is possible also in PreRender.

And you will, but Page_Load gets called before the event handler for the linkbutton .. so, you can't really expect it to be changed yet.