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.NET Forum / ASP.NET / General / December 2007Accessing Session State across pages
I am an amatuer asp.net programmer so I hope this question isn't to dumb. I am having difficulty with my understanding of session state. I have an application that stores some values in the session and then I use the following code to try and get a stream of image data. mypage.aspx has a different session ID then the calling page. I tried to use a relative URI but the getresponse said it couldn't use a relative uri. I've looked at cookie containers but can't quite seem to make them work. I thought that session variables would be available to all pages in my app but I'm thinking that the code below must somehow create, almost like a new instance of something that gets it's own session ID. Can anyone suggest what I am missing or where I am going wrong? Thanks in advance for any help. Dim myURI As New Uri(http://mysite.com/myapp/mypage.aspx) Dim myRequest As System.Net.HttpWebRequest = System.Net.WebRequest.Create(myURI) Dim myResponse As System.Net.HttpWebResponse = myRequest.GetResponse Dim responseStream As System.IO.Stream = myResponse.GetResponseStream() Your asp.net code calling mypage.aspx will have its own session, separate from the one the client on a remote machine has from the asp.net site. This is by design. What is mypage.aspx doing? Maybe you can re-architect it. >I am an amatuer asp.net programmer so I hope this question isn't to dumb. > [quoted text clipped - 16 lines] > Dim myResponse As System.Net.HttpWebResponse = myRequest.GetResponse > Dim responseStream As System.IO.Stream = myResponse.GetResponseStream() It is using some session variables, created by the calling page, to modify an image and then return it. If I embed an imagecontrol in the calling page I can pass mypage.aspx and it gets the image modified by my session state data. I want to get that same image back but in a responsestream. I can see what you are saying about client vs server. I was sort of seeing that as what was wrong but my understanding is still limited. Is there a better way to create and store this data for use in a session? Cookies? Any examples on the web you can point me to? Thanks for your help. > Your asp.net code calling mypage.aspx will have its own session, separate > from the one the client on a remote machine has from the asp.net site. [quoted text clipped - 21 lines] >> Dim myResponse As System.Net.HttpWebResponse = myRequest.GetResponse >> Dim responseStream As System.IO.Stream = myResponse.GetResponseStream() The problem you have here is that you aren't requesting a page in the normal way one would navigate a web site, in which case the SessionID cookie would automatically be transmitted by the browser. What you are doing is programmatically requesting a page via the HttpWebRequest / Response classes. if all this does is get an image, what do you need Session for? You cannot attach Session to something requested over http in this manner. -- Peter Site: www.eggheadcafe.com UnBlog: petesbloggerama.blogspot.com Metafinder: www.blogmetafinder.com > I am an amatuer asp.net programmer so I hope this question isn't to dumb. > [quoted text clipped - 16 lines] > Dim myResponse As System.Net.HttpWebResponse = myRequest.GetResponse > Dim responseStream As System.IO.Stream = myResponse.GetResponseStream() I believe I have caused a problem for myself by trying to extend some code in the wrong fashion. mypage.aspx was first used to get an image and show it in an imagecontrol. Now I just want the response stream. I probably should just write a function or sub that does what mypage.aspx does and use it to get my image data. That way it is all happening on the server. Does that make sense? > The problem you have here is that you aren't requesting a page in the > normal [quoted text clipped - 33 lines] >> Dim myResponse As System.Net.HttpWebResponse = myRequest.GetResponse >> Dim responseStream As System.IO.Stream = myResponse.GetResponseStream() >I am an amatuer asp.net programmer so I hope this question isn't to dumb. > [quoted text clipped - 16 lines] > Dim myResponse As System.Net.HttpWebResponse = myRequest.GetResponse > Dim responseStream As System.IO.Stream = myResponse.GetResponseStream() I may be missing what you are trying to accieve, but if I wanted to transfer a stream of image data from one form to another, I would do it like this: Dim myStream as Stream ' add your data to myStream here Session("myStream")=myStream '//here the stream is stored in as session variable called myStream In the other form you just retrieve this stream of data the opposite way: Dim myStream as Stream=Session("myStream") Very easy. I use it a lot. Bjorn Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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