I need to pass some values around using session state. My approach is to first check if my session variable is null and if it is not, then proceed with my C# logic. Is that correct? Will my Session variable ever contain garbage in it, like a corrupted string? Or will I be guaranteed that it is null if not explicitly set.
if(Session["MyVariable"]!=null {
// Do some logic }
I have a clear button and a textbox in an aspx page. I set the session variable in this page as
String str = Textbox1.Text;
Session["TypeIds"] = str;
and I clear the sessions in a clear button event as
Session["TypeIds"]=null;.
Then when the user types some value in the textbox ,on Response.Redirect on another aspx page, the session variable returns null values.It does not retain its session state. The session state has to be maintained in the next page. Is it because this clear button event and setting explicitly to null creates this problem?
In my application, session value automatically set into null.In certain workflow only it will set as null (Normally It's able to access value). Example, at the time of login, I will set session values. While, user deleting some entries from drop down list of specifc page,client script will show message like selected entry deleted. After that, flow point will move to master page. There I have to access session variables. It's getting null value. I tried to debug with Quick watch, at the pageload of master page only value set into null (automatically).
View 6 RepliesOn my development machine, the session state data is retained after a post back to the server. (XP VS 2008) (This is true if running from within VS or if running in browser with localhost.)On the deployed test server, the session state is blank in IE, but works in Firefox. (Svr 2003 IIS 6)Both machines are running the exact same code with the exact same imputs and same web.config. There is no code between the post backs that write to the session state.Newest addition to the server would be the consumption of a WCF web service. Could this be a symptom of something missing on the server(s) when trying to connect with WCF? I could not find any information other than installing the 3.0 framework. I have 3.5 SP1 installed on the test server.
View 2 RepliesI have an app that worked perfectly in development (Visual Studio 2008 Dev Server/Vista), was setup to use cookieless sessions in the web.config, which worked fine. Now rolled out into production (win2003/IIS6) configured as a Virtual Directory. But I'm having Null session issues after a button click. The problem doesnt persist in FF but in IE8. I tried to change session state to cookies and cookieless (InProc) with no go.
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I am having session null on url routing , I searched the net all solutions are mostly for asp.net 3.5 , am using 4.0.... i dont have modules tag in web.config , i've got httpmodules which doesnt have that property.
View 3 RepliesIn certain pages when i try to rediect to a perticular page the Session automaically gets assigned to null, have no idea why is this happening.-No where I'm using Session.Remove or Session.RemoveAll.-Also not even using EnableSessionState="true" or "false" as by default it will always be true, I know...
View 3 RepliesAt the login page i m using
adminlogin.aspx
Session["Admin"] = txtUserName.Text;
response.redirect("admindefault.aspx");
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I have a requirement where i need to download mutiple files as a single zip file.There is linkbutton named HOME as well in the page. when this linkbutton is clicked it should redirect to homepage.aspx. I found a ICSharpCode.SharpZipLib.dll in net and used in my website. Here is the code
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With the above code i got the expected result i,e. i can zip the files and save on client system. But the problem is after saving/canceling the zip file if user clicks on linkbutton in the page_load event Session[getdata] became null. there is no data in Session. what might be the problem? Actually it should redirect to homepage.aspx but its going to login.aspx because Session[getdata] is null.
I have a Authorizeclient.aspx.cs page where I set my session value.Authorizeclient.aspx is a blank page. HttpContext.Current.Session["nodeID"]="0". This session value changes from 0 or non zero which depends on the value returned by Database. If no value is returned I assign HttpContext.Current.Session["nodeID"]="0" as the default state else I assign HttpContext.Current.Session["nodeID"]=resolve(nodeID).ToString()
Till this part it works fine as expected. However, I have a requirement that I need to read the nodeID from Session in other application on the same server. I mean this application too is part of the root project where I initially created the Session and set it. The strange thing is the Session["nodeID"] in application gets null "SOMETIMES" Not always. I am trying to read the Session in Page_Load. Sometimes it works fine and sometimes it gets null. Moreover the session object do not die and I can see other keys like Session["Themes"] etc there. The session is in InProc mode and have 20 minutes timeout time.
I have a strange problem with the session. I have global.asax with code in the session_start event. This code calls some code that I have in a helper class. When I first run the project in debug everything is fine. However when I stop debugging and then re-run the project it fails and I have discovered that once the code in the helper class is hit the session is null. If I look in the global.asax session_start code the session is instantiated before it enters the helper class. If I then re-build the project and the re-run it everything works fine again! Why does the session suddenly become null and why does a re-build fix the problem?
View 3 RepliesI have a "one page application" (ASP.NET 3.5, VS 2008, IE7) that uses Default.aspx as it's page, and holds an iFrame within "floating panel" (asp:Panel with extenders).
As the desired behavior is to allow users to reopen the application by refreshing the page,
I added this to the Default.aspx.cs:
protected override void OnPreInit(EventArgs e)
{
if (!IsCallback && !IsPostBack)
{
Session.RemoveAll();
GeoApplication.DAL pDAL = new GeoApplication.DAL();
Session["DALinstance"] = pDAL;
}
}
However, when the iFrame page lifecycle starts, the Session["DALinstance"] parameter is null. I've tried to put some additional parameters and those were null as well.
I have logged in to the application and naviagate to Resource Editor page where it allows user to enter the value and saves to the resource file of the application.
After user clicks save button and navigate to different page the session value becomes null.
If the user navigate to different page without clicking save the session variable has its value
Im trying to use code provide in this link below.http://www.codeproject.com/KB/aspnet/MultipleTabWindows.aspxim trying to have the below code in my master page instead of adding to each page. it works if i add to each page, but when i add to ,master page the session value for "WindowName" is always null.how can i fix this?
<script language="javascript" type="text/javascript">if(window.name != "<%=GetWindowName()%>"){ window.name = "invalidAccess"; window.open("InvalidAccess.aspx", "_self");}</script>public string GetWindowName(){ return Session["WindowName"].ToString();}
I want to use session in thread class but it return null in parent that is the page class.
View 4 RepliesCan anyone explain to me why this first example works fine but the second, which would use a little less code and in my mind appears to achieve the same result, yet throws a null ref error?
This works ...
if (Session["sid"] == null || Session["sid"].ToString() == "")
{
// session is NOT valid.
}
else
{
// session is valid.
}
This does not work?
if (String.IsNullOrEmpty(Session["sid"].ToString()))
{
// session is NOT valid.
}
else
{
// session is valid.
}
Ive created an object and placed it in the session, then in my .ashx handler I want to get that object from the session. The problem is that its always null !
heres how ive placed the object into the session from an aspx page
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I need to refresh my webpage in case of a change in the system time. However I see that my session variables are becoming null when the system time changes. So I cannot perform the refresh action since my webpage requests a login.I am not setting the Session variables to null explicitly anywhere in the code. I can't seem to figure out how they are becoming null.
View 6 Replies1. SetSession.aspx page sets value for a session variable and redirects to default.aspx page using Response.redirect() code.
2. Default.aspx page tries to create an object of class in app_codecommon.cs file.
3. In app_codeCommon.cs file, I am trying to access the session variable set in step1 using HttpContext.Current.Session object.
but step 3 gives error that object reference not set to an instance. as HttpContext.Current.Session is null.
I surf abt it on net, and seems to be problem with asp.net framework.
i have 2 page,
1.login.aspx --- 2.welcome.aspx
in my login.aspx im storing username into sesssion as below:
Session["usernm"] = txtUsername.Text;
in my welcome.aspx page
in page_load event
if (Session["usernm"]==null)
{
Response.Redirect("Login.aspx");
}
here if i manulally paste the url ( http://localhost:4125/Loginado/welcome.aspx) it should go to login.aspx for user credentials
but its going directly to welcome.aspx page.
I'm used to using VB.net for web programming.Often, I have something like:
Dim s as string = Session("s")
I get a string value for s from the web session. If there is no value in the web session, I get a blank string.However, AFAIK, in C#, I have to have something like the code below to do the same thing.
string s;
try { s = Session["s"].ToString(); }
catch { s = ""; }
I have an ASP.NET web application that takes user input across several forms. Sort of like a wizard. On the first form, the user enters information then clicks the "Next" button. In the Click event of the button I save some information to the Session object (via Properties in the Master page). I then Redirect to the next page. Here is an example of what I am doing:
protected void NextButton_Click(Object sender, EventArgs args)
{
//Go to the next form
Master.SessionVal1 = Value1;
Master.SessionVal2 = Value2;
Response.Redirect("~/TheNextPage.aspx", false);
}
In the MasterPage.cs..
public long Value1
{
get { return (long)Session["Value1"]; }
set { Session["Value1"] = value; }
}
public long Value2
{
get { return (long)Session["Value2"]; }
set { Session["Value2"] = value; }
}
Pretty basic stuff. When I run this in debug mode in VS2008 it works perfectly. When I push this to a test server (IIS7) I get NullReference exceptions when I try to access Value1, Value2, etc. which is stored in the Session object. UPDATE: I have discovered that if I migrate the code to one server I get the problem as described above. BUT, if I promote to another server it works as expected. Both servers are Windows Server 2008 with IIS7. I have looked at the application pool settings and the state management settings and I do not see any differences.
Have not run the ASP.NET Development Server for a while. Today I copied a production website to my workstation and ran it with VS 2008. The following error message popped up. What is the problem with the ASP.NET development Server on my workstation? The website on the Production server still ran okay.Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of KEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesaspnet_stateParametersAllowRemoteConnection.
If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.
I am reviewing some web code and I am not exactly sure how ASP.net session state works. If a User object is saved to the session state during login, and User.FirstName and User.LastName is set. If other web pages retrieve the user object from the session and set the FirstName to something else is that persisted on other web pages? Or, do you need to re-add the user object back to the session once it has been modified?
View 3 RepliesI have developed an ASP.net project with VB.net and SQL Server 2008.
I have used session variable to store the user id while user login to the system.
The declaration is as follows:
Session("user_id") =txt_user.text
On the first page after login I have displaying the name using this Session value. And the menu also displaying according to the session value.
The code I am retreiving the value is,
dim user_name as string
user_name=Session("user_id")
On my development system everything working fine.
But when I implement the system to live server, the session value is not getting even for the first time.
I don't think this is problem with the code. This is some thing esle..
The implemented computer have Windows XP professional operating system and SQL Server 2008 Express edition datbase.
I have installed framework v2.0 and theIIS version is 5.1