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<%@ 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>Detect refresh and redirect to error page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>Do not refresh this page</h1>
</div>
</form>
</body>
</html>
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using System;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (Session["CheckRefresh"] == null)
Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString());
else
Response.Redirect("ErrorPage.htm");
}
else
CheckRefresh();
}
private void CheckRefresh()
{
if (Session["CheckRefresh"].ToString().Equals(ViewState["CheckRefresh"].ToString()))
{
Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString());
}
else
Response.Redirect("ErrorPage.htm");
}
protected void Page_PreRender(object sender, EventArgs e)
{
ViewState["CheckRefresh"] = Session["
CheckRefresh "];
}
}
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