asp.net postback

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Hi ,

I develop asp.net page.
I have a form to fill and send.
After clcik send button and return to client , if client press F5
the page process seems like client press send button again
how I can prevent from this action

Thanks

Posted 7-Feb-10 8:23am

fadime

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3 solutions

Solution 3

I have good solution for this....

Encode your url to current datetime using and then add this url into session object e.g.

Session("update")=Server.URLEncode(System.DateTime.Now.ToString())

Add this session to view state. For this, you can use page pre_render event

Sub Page_PreRender (sender As Object, e As EventArgs)
    ViewState("update") = Session("update")
End Sub

and finally check this session to view state

If (Session("update").ToString() == ViewState("update").ToString())
{
//your code for inserting... updating... etc.
}

Posted 8-Feb-10 4:07am

Indrajeet Sutar

Solution 2

To work with the email forms look php form tutorial. Perhaps you have something wrong with the code.

Posted 8-Feb-10 3:48am

vorotnik

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Christian Graus · Accepted Answer · 2010-02-07T09:05:00

F5 reloads a page, which means it posts the data from the last action, which was the post with the postback data. To avoid this, when you've processed the data, do a Response.Redirect or a Server.Tranfer back to the page you are on, this replaces the postback with a load of the page with no postback data. I remember clearly doing this in an ecommerce site, but I don't recall which of the two I used, or if both work, so try both and one will definitely do it for you.