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!POSTBACK not working as expected

Posted By:      Posted Date: September 16, 2010    Points: 0   Category :ASP.Net
I have a site I am trying to set up where the form can be submitted via click of button but when refreshing the page, I do not want it to resend the message. i have found several sites that show using Session Variables and !Postback, but for some reason, when using this action I am still hitting the !Postback condition even when I  do a refresh which I don't think is supposed to happen. Also, when it refreshes it resets the Session["checkrefresh"] variable and throws an error  Object Reference not found i believe on the if statment with the .ToString() check against the ViewState.  Any ideas would be awesome because I'm running out of them         ASPX.CS pageusing System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace CarouselApplicationSuite { public partial class TEStRefresh : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { // If this is not the first time and is a refresh (not button click) set Session Var if (!IsPostBack) { Session["CheckRefresh"] = Server.UrlDecode(System.DateTime.Now.ToString()); } } protected void Button1_Click(object sender, EventArgs e) { if

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