At every hit count,value get added with previous value store in ViewState

In page_load event



        int a;
        if (ViewState["no"]==null)
        {
            ViewState["no"] = 0;
        }
        a = Convert.ToInt32( ViewState["sum"]);
        i = Convert.ToInt32(ViewState["no"]) + 1;
        
        ViewState["no"] = i;
       
        if (a == 0)
        {
            a = Convert.ToInt32(ViewState["no"]);
        }
        if (ViewState["sum"] == null)
        {
            a = 0;
        }
        ViewState["sum"] = a + Convert.ToInt32(ViewState["no"]);
        Response.Write(ViewState["no"]+"sum:"+ViewState["sum"]);


Value get added with previous value store in ViewState in every postback