State Management :: Saving Sessionstate Variable On Button-click?
Nov 12, 2010
I am performing my first steps with ASP.NET for my employment.Yesterday I tried to perform saving a value to a sessionstate variable, but it does not work.I am using C# and want to code in .NET 3.5. [Code]....
The click performs a postback to a second website where the value is to be displayed on a simple label.The value I initialized in the Global.asax is saved to the variable and then read on the second page, but I cannot manipulate it using the textbox and the button on the first page. I just don't get it...I even tried on different machines and different VS editions.
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Similar Messages:
May 5, 2010
I have a problem regarding the SessionState Collection.I retrieve an object
[Code]....
I thought that i access a reference type. But calling the default constructor to build a new object seems not to work.The next time I access the object I still get the old one.
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Jul 1, 2010
I have this button click event under which I have assigned session values. I am using this to pass variable to the user control which is utilised in that page. the issue being the session variable is not getting over written on one click. it is like I have to click twice to get the value up and running.
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May 13, 2010
[Code]....
From my understanding, the asp.net 1.1 application will login the user then store the information to a session and a cookie? I'm trying to access that cookie with a asp.net 2.0 application. Is this possible?
I'm thinking the mode would need to change to maybe StateServer or Sql.
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Jun 30, 2010
what the difference between
SessionState Timeout
and
HttpRuntime ExecutionTimeout
is? Both in web.config. I want to increase or reduce the timeout in my webapplication. Means: If a users idles more than 10 min. the should get timed out.
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Nov 4, 2010
I want to transfer a variable to another page when a button is clicked. I include the html code in label.text.
Source code is as follows:
MyLabel.Text += "<button type="button" onclick="location.href='a.aspx?oid='+this.oid"><b>Detail</b></button>";
oid is the variable that I want to transfer.However, It says "http://localhost:61884 OBJ_Browser.aspx?oid=undefined" when I click this button.
how I can transfer the value of oid to another page?
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Mar 16, 2011
My session variables don't get saved if the SessionState mode in the web.config file is set to StateServer. But when I changed it to InProc, then everything is fine and good. I'm trying to save a custom built object (or class) into the session after the user logs in.
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Sep 8, 2010
I'm building a site using the .NET 4 framework using routing and MasterPages.
Because I'm using both routing and MasterPages, I can't see any way how to get value from control on the previous page. To solve this I've used the code behind to store the control's value in a session variable. Is there a way to retrieve a value from a control using PreviousPage or something when using Routing and MasterPages?
This works fine in VWD debug mode and in IIS 5.1, but when I try to deploy it on my Windows Server 2008 (IIS7.5) machine, it get this error:
Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. also make sure that System.Web.SessionStateModule or a custom session state module is included in the <configuration><system.web><httpModules> section in the application configuration.
Here is a copy of my web.config file:
[Code]....
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Apr 18, 2010
I have 2 webpage 1 is a.aspx and 2 is b.aspx on a.aspx it contain gridview data on 2paging when click on gridview data on 2paing link to b.aspx so on b.aspx have back buttom when i click on b.aspx it will be back to a.aspx but i dont want a.aspx refresh data to 1 paging. I want to click back buttom it show data on a.spx on 2paging not 1 paging.
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Oct 12, 2010
I Have two pages source.aspx and target.aspx. Source.aspx has one button and other form controls the collect input. The button has its postbackurl property set to target.aspx. On target.aspx I have another button and other form controls that collect input. When the user clicks on the target.aspx button, I want the inputs from both source and target gathered to be inserted into the database. The problem is the Page.PreviousPage property is only available during the initial rendering of the target.aspx page. So when I click on target.aspx button, PreviousPage is now null.
One strategy of mine is to collect the information on page_load and store it in ViewState, but is there any other method that I should consider in this process. I think the cleanest approach would be to somehow access PreviousPage on the button_click event handler, but how can I access this property.
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May 17, 2010
I have a web application which uses a session variable to store the logged in userid. If no user is logged in, of course this variable will be empty and the contents displayed on my website are meant for guests. If there is a user logged in, the user specific controls/access/links will then be a displayed.
I am now having issues with my hosting where on shared application pool, the worker recycle is triggered every 90 minutes, this will clear sessions causing all my users to be logged out. I opted for a dedicated application pool, which got worse because I am only allocated 50MB memory limit and if this is reached, the worker recycle is triggered and I lose my sessions again. I have tried as much as possible optimization techniques, e.g. dispose where possible, close connections, disable viewstate for static controls etc but my memory per instance keeps building up from page to page without any signs of improvement. I don't use loops nor store huge objects like bitmaps etc but my sessions are now gone even faster than 90 minutes in shared application pool before.
I have considered using SQL Session State but there isn't a simple guide on using this with MySQL. I am getting desperate and considering using a public variable, a string as a replacement to store logged in user id instead of in a session variable. I am pretty sure this will solve my issue with sessions being recycled but are there any negative consequences of doing this? One problem I can think of is if the user closes the browser, the system will never know that the user is now logged out and this public variable should be nothing. In this scenario, will the GC eventually clear this abandoned public variable.
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Dec 3, 2010
I am building a web app that is limited to one database, therefore I cannot use the ASP.NET config tool. As a quick means of getting this app online, I tried to use a simple session variable. The login page verifies the user's credentials, and if they pass, it sets the session variable to a certain value. All other pages check in the page_load event whether or not the session variable is equal to that value. The problem is that once being logged in for a short while and sending and recieving some data, the session variable resets, and I'm returned to the login page to repeat the process. Here's the basic code from my webforms:
[code]....
Is there some setting I need to change in the web.config file to adjust the cookie timeout or is that only for the config tool authentication methods?
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May 18, 2010
I am trying to save the every date clicked in a List of Date using a session variable. I am getting a casting error ..."when casting a number the number must be less than infinity".
[Code]....
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Sep 24, 2010
I have overridden the following methods:
LoadPageStateFromPersistenceMedium()
SavePageStateToPersistenceMedium(object viewState)
in a class that my page derives from, so that the viewstate can be stored in DB.
Now, on page_load of my page, I am checking what control caused a postback & based on that I am forcing execution of 2 button click events in a row (by overloading those click events & calling them explicitely), but the behaviour I want is as if the execution of those 2 button click events went through the regular page life cycle.
Here is the sequence of events that happen in typical page life cycle & notice I want to alter behaviour at step 4 (on load):
1) Initialization
2) LoadViewStateData (here the viewstate is loaded from my database using the overridden LoadPageStateFromPersistenceMedium)
3) LoadPostBackData
4) Load
Here, I would like to force execution of 2 button_click events based on whether a particular control posted back.
4.1) imgBtnPrev5_Click()
4.2) imgBtnPrev4_Click()
Now, when the imgBtnPrev5_Click() is executed, the viewstate is already loaded, so we are fine. But after execution of imgBtnPrev5_Click(), I would like to update the viewstate object in memory & then call the overridden SavePageStateToPersistenceMedium (by passing that updated viewstate object as its parameter) and then before execution of imgBtnPrev4_Click(), I would like to call the overridden LoadPageStateFromPersistenceMedium.
5) RaisePostBackEvent
6) SaveViewState
7) Render
My question is, how do I update the "viewstate" object of the page - that is passed to SavePageStateToPersistenceMedium with the changes made to the controls in imgBtnPrev5_Click()?
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Jun 23, 2010
I have a multiview inside an updatepanel. in one of the views, I save a value in a session object like this:
Session["xyz"] = "some string value";
Then I switch to another view and try to pick it up the value in a button's OnClick event:
string x = Session["xyz"].ToString();
But I get a null reference error. Debugging it shows that Session["xyz"] is indeed null, yet other Session variables are still there. Is there something special about Session and AJAX?
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Mar 17, 2011
I have define a variable called number of type int just after the the class definition as follows.
[Code]....
I store a value from a sql query result in the Number variable. ( eg: lets say 23). This gets assigned correctly to theNumber variable. ( checked using a break point)
Then the user does some updates to the web page ( data entry). The web page includes post back events also.
Finally I need to update the webpage in the database. When I do this I see the Number variable has change to 0. ( and not the 23 as in our example). Its always 0 at the time when I update.
I do not do anything for the number variable in the code.
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Jan 18, 2011
i want to use seession like variable in mshtml.
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May 3, 2010
want to use the value of a variable on to the other page, what i am supposed to do for that.i am novice at asp.net
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Dec 28, 2010
I'm fairly new to ASP.net development as may have been noticed by some of my other posts and so here goes another one.I have a web page in which I allow users to enter data that will be used to populate a database and then graph data based on the information that was saved in the database. I have 10 sets of criteria that the user can enter and as they enter values for each individual set, I make sure all the parameters are filled in and set a variable called blnParm1, blnParm2, blnParm3, etc. Anyway, as each DropDownList box fires off an event the values of my blnParm variables is reset because each time the event is fired the page is PostBack therefore my variables are redeclared. I know the page is being PostBack because each of the DropDownList boxes have AutoPostBack set to true. I had to do this so that I could get the OnSelectedIndexChanged event to fire for each of the DropDownList boxes. So, how do I preserve my variables through this PostBack or how do I get the events to trigger without calling AutoPostBack?
Some more info, my variables are declared globally in my aspx.cs file as private bool. The code is working like it should as far as populating drop downs dynamically based on other data input by the user, the controls all have their values preserved as the page is PostBack.
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Jun 16, 2010
Each time a session starts, I save
Session("UserName")= xyz$
My question is:
what would be the vb code to get a list of all "UserName" 's
(session alive at this moment) ?
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Jul 18, 2010
I have two projects ,one is webforms and other is Business logic, i am storing username in Session Variable, i have audit module in businss logic which has event handlers to do auditing on object create / remove. i want to store username in audit trail, i want to save username in some global place which is session bounded so that i can get the username in my audit module.i dont want to refer System.web, or httpcontext in my businesslogic project.pls help how i can acheive this. i found this article but cudnt understand much.
"Now one option if you want to have your DLL pull the stuff from Session is to abstract out session. So you could define an interface like IStorage, that your library will know how to use. Then you can have a SessionStorage or MemoryStorage class and use IoC to inject the appropiate class into your library classes. This gives you the freedom to code it how you wanted it to be coded without tying your code to Session. Oh and one other benefit if done properly can be used to not tie your code to session in the web either.
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Sep 24, 2010
I know the big difference, but one thing is confusing me. Cache works only on a single machine on webfarm and to make it globally we use Velocity or memcache.So is static does same, or is it already work globally ?
eg
Cache["someid"] = "value"; //this will only work on single machine cache,
static string abc = "value"; // will this work on single machine or globally ?
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Feb 20, 2010
I am using ASP.NET 2.0I am little bit confuse about using of Session Variable. I have a three page web application. When a user login, after verification of user credentials I get user ID from DB and store this ID in a session variable.Session("USERID") = 56by using this ID I can get 20 different values from database as User Full name, user date of birth, user location, user date of joining, User Commission rate etc. I need some of these values in Page 1, some in page 2 and some values needed in Page 301. After successfully login and getting the User ID, I take all these 20 values from Data Base and store these values in an ArrayList and store this ArrayList in a seesion and whenever I need to use any value I take these values from ArrayList which is save in Session variable.
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May 14, 2010
I'm looking for a way to declare a global variable (so all pages could see) but personal (so if one user puts some value in it, it won't matter to another user or change his value).Sessions and hidden fields won't do. I've tried working with declaring keys in Web.config but unfortunely, the keys values aren't personal, and all users share the same key value.Another way I was thinking was maybe classes, but perhaps there might be an easier solution?
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Apr 21, 2010
I have 2 arrays declared like this :
[Code]....
and i wish to put both in one session variable and then retrieve it to get one array like:
{"intItemID","strCategory","strType"}
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