Resend of data on refresh browser

stop multiple data or stop resend data during refresh.

show this link
http://aspalliance.com/687_Preventing_Duplicate_Record_Insertion_on_Page_Refresh.all

http://forums.asp.net/p/1190997/2045619.aspx

hi,
I know of a method where you can maintain a session variable to prevent db update on refresh.

 Sub Page_Load (sender As Object, e As EventArgs)     If Not Page.IsPostBack         Session("update") = Server.URLEncode(System.DateTime.Now.ToString())     End If End Sub
Sub Page_PreRender (sender As Object, e As EventArgs)     ViewState("update") = Session("update") End Sub Sub Button1_Click(sender As Object, e As EventArgs)     If Session("update").ToString() = ViewState("update").ToString() Then         If AddEmployee(firstName.Text, lastName.Text) = 0             Message.Text = "Success"             Session("update") = Server.URLEncode(System.DateTime.Now.ToString())         Else             Message.Text = "Failure"         End If     Else         Message.Text = "Failure - Session"     End If     firstName.Text = ""     lastName.Text = "" End Sub

Should the user refresh the page, the ViewState variable will be repopulated 

from the post header, so then the ViewState and Session variables will no 

longer hold the same values, and the INSERT command will not run. 

Read this article for better understanding. http://aspalliance.com/687