Asp.net - SessionID Randomly Changes On Postbacks?
Feb 3, 2011
Our solution is built on ASP.NET v1.1 framework. User is presented with login form, so upon providing credentials this information is posted back to the server. Upon postback SessionID changes and our application crashes as some information which is required for processing is stored in the cache and is identified by SessionID string as a part of the name.
This SessionID change happens absolutely randomly and only to some of the clients. Most of the time browser used to view the page and post info is IE8. I cannot reproduce this issue in our test environment, as SessionID is persistent though-out the whole testing process.
I've already checked all solutions, i.e.
Session cache is used on Page_Load to retrieve/store some information, so it's initialized and contains data stored. I've made a Health Monitoring check on Application_End event to capture any possible AppDomain crashes using Reflection and Diagnostics Libraries and retrieving ShutDownMessage from httpruntime object, but that's also not a case. Cookieless attribute of the sessionState in web.config is set to false (using URL to store SessionID is not an option)
All MS security and bug fixes are installed on the server. IIS Server settings are similar to the ones we use in Test Environment.
I have an asp.net page within which I've used several AJAX controls doing partial postbacks with update panels. In testing it works wonderfully, all of the postbacks are done without reloading the page and it makes the whole process smooth. I uploaded this to the web server for some outside testing and all of the tested reported that the page was reloading a lot. I tried it within the network from the web server and it was still working fine. However, when I tried it from outside the network at home, it does in fact appear to be doing full postbacks whenever it's set to do partial postbacks for these update panels.
I can't seem to find out why this is happening. Even with the increased time it takes to communicate with the server, it shouldn't reload the page - it should just, at most, stall for a moment. Another strange thing is that it's not maintaining the scroll position even though I have it set to do so for the one or two full postbacks I have. It reloads to the top of the page.
I'm thinking perhaps this may be something set on the server, but I can't be sure.
i must change the SessionID for an ASP.NET 4.0 Application (SessionID via Cookies) to have it run on 2 domains with the same Session [URL]... This will keep the Items in sync abov the 2 domains.
Therefor the Page will have iframes with an "setkey.aspx/ashx", which must set the new SessionID.
I have a website, that needs to not allow simultaneous logins. I am controlling that by cache. But, now I am unable to give them the option to log out the other session. Goal: is to allow them to login, and when they do, tell them that the current user is already logged in, and give them an option to close that session, so they can continue logging into the system (website).Have not found any way to terminate a specific SessionID. oh BTW, I do have the sessionID of the parallel session, just dont know how to kill that one. Again note, I do not want to close this current session, but another session whose SessionID I have.
I've been trying to find a way to determine if I need to launch an application or maximize it because it is already running for the current user. The problem I am running in to is since I'm using the For Each command the application though it now knows to open the external .exe wants to open multiple since more than one instance of the application is running without the same SessionID.
VB.NET Private Sub OrderLaunchOrSwitch() Dim CurrentSessionID As Integer = Process.GetCurrentProcess.SessionId Dim hwnd As IntPtr
Alright, so here's my basic ASP.NET page setup: I've got a page with a GridView that has ContentTemplates in it. You can add a row and edit/remove rows at any time. There's a "New" button that creates a new row.
All of this data is bound to custom data objects. So if I have a GridView of "People" and each row has "FirstName", "LastName", and "Gender" (with TextBox and DropDown controls), I then have a "Person" object which has public properties for "FirstName", "LastName", etc. I have the binding set up correctly, and I can push data into the GridView from the object, and I persist the object with the Session variable. My page lifetime structure looks something like this:
Page_Load: Loads the List(Of Person) from Session() Any events fire, and modify the List(Of Person).
After any event, the List(Of Person) gets saved back into Session(), and is then DataBound to the GridView (and any subsequent fields are also DataBound, such as the DropDownList.
My question is: Whenever I fill in rows in the GridView, and then add a new row (there is no database saving going on whatsoever), my fields clear out and don't persist across PostBacks. So, how can I persist my custom data objects with databinding across postbacks?
I need to show a drop down list when the page loads, the default selected value is nothing, or an empty element (such as "-"). When the user selects one value from the list, another drop down list is added below the first one, and so on.My problem with this is how you make the page to remember the drop down lists created through postbacks and the values they have selected?
EDIT: I did this example for dynamically add drop down lists and suscribe them to an event handler but the event won't fire.
EDIT 2: Changed the code because I labelled for VB.Net and posted something in C#. I update the code with some trivial improvements, but still won't fire the event :(
Private myDdlArray As New List(Of DropDownList) Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If (Session("ddl") Is Nothing) Then
I have an ASP.NET form that the user can make lots of changes to, each time they make a change the page PostsBack and the details are updated.If the user hits the browser back button they go back through all the previous versions of the page.Is it possible to stop each PostBack being treated by the browser as a new page?
I am settting up control propertis on page load. Like visiblilty of control depending on loaded data. And very simple setting up images to button controls. For page load it works fine but on postback these values are not set back. This is my code. When it's a postback btnSecurityQA image is missing and visibility of all following controls is not set accordingly.
If Not IsPostBack Then ButtonImage.SetPath(btnSecurityQA, GetLocalResourceObject(btnSecurityQA.ID & "BaseName").ToString())
In VS2010 I have VB.NET codebehind aspx pages and I'm using Ajax multihandleslider extensions to filter search results on numerical values.
Fistly, the multihandle sliders don't display in the designer... I have to remove the slider targets tag:
In order to make it display in the designer... this isn't so much a big issue but an annoyance.
I am displaying items in a given category. So I get the max and min prices for all items in that category and assign the sliderextension max/min values appropriately.
This works fine until... I change the item category and go get a new max/min value for the slider control. I set the max/min values, then I set the target textbox values each to the corresponding max/min values.
The slider handles don't repaint (or init?) properly Like say for example my initial min/max is 1/100 if I do a full postback and change the max value to 1000 then the slider bar (correctly) stays the same size but the handle appears WAYYYY to the right off the page and I have to scroll to it. When I click it, it shoots back onto the slider bar.
Protected Overrides Sub LoadForm() MyBase.LoadForm() Try 'StartProcess might be causing an error (error msg is issue with loading config, which would be incorrect) StartProcess() [Code] .....
I can run this 100 times under the exact same conditions and it seems like 40 times it will crash with the following error: "Cannot access a disposed object. Object name: 'frmImportExport'."
It will either die on 'within StartProcess() Dim __Delegate As New _Delegate(AddressOf StartProcess) Me.Invoke(__Delegate) or Dim D As New _Delegate(AddressOf SOPERATION)
The form isn't being disposed manually anywhere that I see, and this code is being executed on formload. It's a subform that is to be displayed within a main form.
I have to make a card game called SNAP. The point of the game is that two players will flip their card and if they match then one of them have to call out snap. The first one to call out snap gets the card.
I'm having trouble on getting the cards to generate randomly but match every now and then.
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A few problems I am facing, 1) I do not know how to do do "randomization" in VB.Net and 2) I do not know how VB.Net would handle displaying an image, would it display on the form i am building or would it display in the default photo viewer for Windows?
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Group 1-BobJoeBrianJillJorge Group 2-SandersRientzLopezGumpStaudmann then output something like "Brian Staudmann" or "Jorge Gump"
Except I want a significantly larger selection of first and last names in each group. Would it be best to save them in an array? A String? Parse from textfiles?
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I have a form with one richtextbox and one button. The idea is that: Form Load: data read from text file into arrayButton Click: random number generated, then used to select the string whose index number matches the random number generated
My StreamReader is working correctly and I can create random numbers with no problem, but I'm stuck on how I can use this random number to extract the corresponding string. I keep get the error saying QuoteObject reference not set to an instance of an object.
My code is below: Imports System.IO Public Class Form1 Dim questions(69) As String Dim i As Integer [Code] .....
Right now I have a program that checks login credentials against my Access(2003) database.It works, but the problem I'm having is that it's checking if the file.exist to frequently and with no real pattern. How I'm doing it isI have a My.Setting that saves the file path string as well as the connection string, during form_load I check if the My.Setting path string exist, if not then use an openfiledialog to find the file. Right now I have the database in a public drive, which is why I think that my program thinks that the file doesn't exist sometimes. This is how I'm doing all of the above:
'Some global variables commented out 'Dim log As String = My.Settings.loginStr 'Dim logCon As String = My.Settings.loginCon
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im trying to make a single image appear randomly at any given time i have tryed to figure out the code for this my self however i have had no success any ideas
