<%@ Page Language="C#" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server"
Text="Label"></asp:Label><br />
<br />
<asp:Button ID="Button1" runat="server"
OnClick="Button1_Click"
Text="Button" /></div>
</form>
</body>
</html>
Now in the Page_Load event i m creating a Session Variable and assigning System date and time to it , and in Page_Prerender event i am creating a Viewstate variable and assigning Session variable's value to it
Than in button's click event i am checking the values of Session variable and Viewstate variable if they both are equal than page is not refreshed otherwise it has been refreshed.
Than in button's click event i am checking the values of Session variable and Viewstate variable if they both are equal than page is not refreshed otherwise it has been refreshed.
public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString()); } } protected void Button1_Click(object sender, EventArgs e) { if (Session["CheckRefresh"].ToString() == ViewState["CheckRefresh"].ToString()) { Label1.Text = "Hello"; Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString()); } else { Label1.Text = "Page Refreshed"; } } protected void Page_PreRender(object sender, EventArgs e) { ViewState["CheckRefresh"] = Session["CheckRefresh"]; } } 
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