返回上一页时如何加载上一个ViewState

Question

I want to reload all my user changes when he want to go back on previous page and I tried to use LoadViewState() and SaveViewState() methods like this:

     protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
               if(Session["savedViewState"] != null)
                  {
                     Object saved = (Object)Session["savedViewState"];
                     LoadViewState(saved);
                  }
            }
            else
            {
                Session["savedViewState"] = SaveViewState();   
            }
        }

but it did't work. The session savedViewState is null. But I still do not know if these methods can solve the problem of reloading my all view state.

Answer 1

you need to switch the code between the if else conditions

    protected void Page_Load(object sender, EventArgs e)
    {



              if(Session["savedViewState"] != null && SaveViewState()!=null)
              {
                 Object saved = (Object)Session["savedViewState"];
                 LoadViewState(saved);
              }  
              else
              {
                  Session["savedViewState"] = SaveViewState();
              } 

    }