Weird ASP Session Issue

[cancer10]

I have an ASP page which has this script at the top of the page:

<% if session("username") = "" then 
response.redirect "notification.asp?error=notloggedin" 
end if
%>

Which means the page needs a value in the session variable "username" else it would redirect to the "notification.asp" page. This works perfectly when I click on hyperlinks that points to the above page. But if I click on a button instead of a hyperlink then the session does not work. Any idea why?

Code for Button:

<input type="button" value="Back To Home" OnClick="location.href='add-contact.asp';">

Thanx

[yamaharuss]

I don't see any reason why the session "does not work". What does the session variable become when using the location method?

[cancer10]

I don't see any reason why the session "does not work". What does the session variable become when using the location method?

it becomes empty

[yamaharuss]

Have you tested that the session variable exists on the form page?

[cancer10]

Yes it does

[yamaharuss]

I think you need to double check that...

here's a successful test, feel free to recreate it..

a.asp

<% session("username") = "Russ" %> 
<input type="button" value="Back To Home" OnClick="location.href='b.asp';">

b.asp

<% Response.Write ("hello " &session("username")) %>

The above works fine.