Detecting Page Refresh in ASP.Net

Detecting Page Refresh in ASP.Net

There are certain Scenario when we want to detect whether the page was refreshed or not. Or, Whether It was a Postback or a F5 Refresh.. The following Code Snippet will help you out to resolve this Issue..

Design Part:

 <asp:Label ID="Label1" runat="server"></asp:Label>
 
    <asp:Button ID="Button1" runat="server" Text="Do postback at server side"
        onclick="Button1_Click" />

Coding:

private bool IsPageRefresh = false;
        public bool IsPageRefresh1
        {
            get { return IsPageRefresh; }
            set { IsPageRefresh = value; }
        }
 
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                ViewState["postids"] = System.Guid.NewGuid().ToString();
                Session["postid"] = ViewState["postids"].ToString();
            }
            else
            {
                if (ViewState["postids"].ToString() != Session["postid"].ToString())
                {
                    IsPageRefresh = true;
                }
                else
                {
                    IsPageRefresh = false;
                }
                Session["postid"] = System.Guid.NewGuid().ToString();
                ViewState["postids"] = Session["postid"].ToString();
            }
        }
 
        protected void Button1_Click(object sender, EventArgs e)
        {
            if (!IsPageRefresh1)
            {
                Label1.Text = "Page do normal postback";
            }
            else
            {
                Label1.Text = "Page refresh";
            }
        }

Now Check the Output by pressing F5 Key and by clicking the Button..