Refersh problem

Guest · Oct 16, 2004

hi
i have one aspx page on which i have one button

in code behind i wrote a code for inserting a record.
if i clicik on button it inserts a record
ok ite fine
but the problem is that if i refresh the page
it will go again into button_click event and add the same record again

why so. ?

plz help me

Davide Vernole [MVP] · Oct 16, 2004

bhavik said:
hi
i have one aspx page on which i have one button

in code behind i wrote a code for inserting a record.
if i clicik on button it inserts a record
ok ite fine
but the problem is that if i refresh the page
it will go again into button_click event and add the same record again

why so. ?

plz help me

Because when you require a refresh from your browser, it perfome the last
request you made. In your case this request contains the postback event
generate clicking the button.

Guest · Oct 16, 2004

hi

U gave the reason behind it but I need a solution.
what should i do??
bhavik

Guest · Oct 16, 2004

Yes, the problem is that the browser caches the last request info. Refresh
causes resubmission of the last request. You want to prevent any caching by
the browser. Add this code to page load event:

Response.Cache.SetCacheability(HttpCacheability.NoCache)
Response.Expires = -1

Guest · Oct 18, 2004

hi Lenn

I have try it but it's not working. plz help me out this problem.

Guest · Oct 19, 2004

ok keep that code and also add this tag to the <head></head> tag of your page
<HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">
What browser are you using? from what you described, I think it is a problem
with page last request being cached and resubmitted on refresh...
If nothing else works maybe you should build in more logic to check if
record was already insereted by that user. Like store session ID in that
table, and enable unique constraint on that field. THough if you can prevent
user browser from caching it should work (I think)
Good Luck

Guest · Oct 21, 2004

You can also try setting the property smartNavigation = true;

What type of button are you using?

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Refersh problem

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