T developers habitually reference Session variables mcna texas medicaid provider manual without ever checking for null first to see if they are actually present, which causes the "Object reference not set" exception. .
Alsom a reader came up with a potential situation where somebody might return to the site after visiting another site and still have their session cookie, thereby possibly triggering the redirect.
Let's take a look at the code for the control: namespace PAB.First I check to see if the developer forgot to set the RedirectUrl property on the Control, because without that we would be all dressed up with no place.With this information in hand, it was very easy to create a "non-visible" T Server control that would hook and override a late Page LifeCycle event, PreRender, to perform this check.OnPreRender(e if (this._redirectUrl null) throw new Property Not Set.Without this technique it is difficult to know, when a session variable is not found, whether it was never set properly or that the user simply waited too long between requests. .Logic normally dictates that if a session is expired, any saved state needs to be recycled back to its starting state, and typically the user should also be required to re-authenticate to the site in order to enable them to start whatever process they abandoned.Null) if (NewSession) string sCookieHeader quest.Finally, we redirect the user to the specified redirect page on the site.That yellow error page doesn't look very professional to the user, either.That's what brought me to think of the idea of a "drop on the page" Session Timeout "Detect and Redirect" Control.
You may need to think about this for a while, but eventually the logic should make sense.
This is because the intrinsic okies and okies objects actually share the same collection, and in this test we only want to inspect the actual cookie from the Request Headers.
Just wait at least one minute after requesting the px and then refresh.If it is true, we need to check our cookie, so we strip it out of the Request's Headers Collection and test for the "T_SessionId" standard cookie name.The beauty of this arrangement is that it requires no base page class to inherit from; nor does it have to be called for every Request.So, I set out to do some more research and see what solutions might be possible.We often get forum posts here asking "How can I tell if a user's Session is timed out, and perform some action in response?" Often this involves the incorrect assumption that the Session_End event can be used for this.