C# - Store Viewstate In The Session Rather Than Bulking Up The HTML
Jan 7, 2011
I'm trying to get asp.net to store viewstate in the session rather than bulking up the html.
Now i've read that asp.net comes with the SessionPageStatePersister which can be used instead of the default HiddenFieldPageStatePersister to do this. I was wondering how i go about dropping it in?
This is what i've got so far:
I think i need to create a PageAdapter that returns a SessionPageStatePersister from its GetStatePersister method, and somehow get the page to use this pageadapter. But Page.PageAdapter only has a getter, so i'm not sure how you set it.
See the 'remarks' heading here: [URL]
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Apr 21, 2010
I have a DataTable with about 10,000 rows in it.
I would like to store this data once for aspx page. When the user selects different options in the page, data is further selected from the already stored DataTable.
I tried using the ViewState, but as soon as the data grows beyond 100 rows, performance degrades.
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Nov 9, 2010
I need to store viewstate in session to optimize my page performance on postback.
I am developing ASP.Net Website, using Visual Studio 2008.
I created a class named "BasePage" under "App_Code".
[Code]....
Now, I know if I inherit this class in all of my pages, that will work but I am looking to do this through Config file.
Is there any way that I can write something in Config file to use this class for all the pages?
so that if I want to remove, I can simply remove from config file and I do not need to compile my whole project again.
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Nov 11, 2010
Its related to datatable in gridview store in session and then session retrive and store to database. basically i am using gridview here creating new row for button click and these row adding untill user's last entry then submit all these entry to database. so i want to use session variable to store this data temporarily and after final entry user click on submit button and all data shold be save in db.
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Jan 26, 2011
I can tried save some data to ViewState, but i get this Error:
Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Error serializing value 'HeRMeSSAAS.BussinesProcess.BussinesServices.CandidateService' of type 'HeRMeSSAAS.BussinesProcess.BussinesServices.CandidateService.'
Code:
private IActionService ActionService
{
get [code]...
How i can store value to ViewState?
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Apr 29, 2010
EDIT: ViewState does not change when browser is refreshed, so even if you write to viewstate it will not save the data. i am trying to store a Queue in a viewstate (to track postbacks and refreshes to stop a form from resubmitting). The Queue is only saving with a count of 1 (the first item that is added to it) no matter how many items i add.
// New Queue of strings
private Queue<string> sTemp;
private Queue<string> p_tempQue
{
set
{
ViewState["sTemp"] = value;
}
get
{
return (Queue<string>)ViewState["sTemp"];
}
}
//BasePage constructor
public BasePage()
{
//create a Queue of string
//sTemp = new Queue<string>();
this.Load += new EventHandler(this.Page_Load);
this.Init += new EventHandler(this.Page_Init);
}
//In the 'page_Init' event we have created a simple hidden field by name 'hdnGuid' which is attached to the page on the first hit itself.
protected void Page_Init(object sender, EventArgs e)
{
//initializing the hidden field
//create a hidden field with a ID
HiddenField hdnGuid = new HiddenField();
hdnGuid.ID = "hdnGuid";
//if it is the first time the page is loaded, create a new guid and assign it as the hidden field value
if (!Page.IsPostBack)
hdnGuid.Value = Guid.NewGuid().ToString();
//add the hidden field to the page
Page.Form.Controls.Add(hdnGuid);
}
//In the 'page_Load' event we check if the hidden field value is same as the old value. In case the value is not same that means it's a 'postback'
//and if the value is same then its 'refresh'. As per situation we set the 'httpContent.Items["Refresh"]' value.
protected void Page_Load(object sender, EventArgs e)
{
if(p_tempQue != null)
sTemp = p_tempQue;
else
sTemp = new Queue<string>();
//The hdnGuid will be set the first time page is loaded, else the hdnGuid
//will be set after each time the form is submitted using javascript.
//assign the hidden field currently on the page for manipulation
HiddenField h1 = (HiddenField)(Page.Form.FindControl("hdnGuid"));
//create an instance of the GuidClass
GuidClass currentGuid = new GuidClass();
//set the GuidClass Guid property to the value of the hidden field
currentGuid.Guid = h1.Value;
//check to see if the Queue of strings contains the string which is the current Guid property of the GuidClass
//if the are equal, then the page was refreshed
if (sTemp.Contains<string>(currentGuid.Guid))
{
//adds item as key/value pair to share data between an System.Web.IHttpModule interface and an System.Web.IHttpHandler interface during an HTTP request.
System.Web.HttpContext.Current.Items.Add("IsRefresh", true);
}
//if they are not requal, the page is not refreshed
else
{
//if the current Guid property in the GuidClass is not null or not an empty string
//add the new Guid to the Queue
if (!(currentGuid.Guid.Equals(null) || currentGuid.Guid.Equals("")))
sTemp.Enqueue(currentGuid.Guid);
System.Web.HttpContext.Current.Items.Add("IsRefresh", false);
}
p_tempQue = sTemp;
}
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Feb 6, 2011
I want to store some byte[] to ViewState. For example I want to store a list of FileBytes. How can I do it?
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Jan 30, 2010
can we store viewstate other than in hidden field in asp.net
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May 27, 2010
I want to store List<Class> object to ViewState, when i try to do this than its giving me error to make class serialize,but my class is partial class so didn't get serialize keyword on class how can i store List object to viewstate.
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Jan 3, 2011
i want to store IQueryable value to ViewState. my code is as below:
Private
Property _Query()
As IQueryable
Get
Return
CType(ViewState("_Query"), IQueryable)
End
Get
Set(ByVal value
As IQueryable)
ViewState("_Query") = value
End
Set
but when i run my page i get following error:
Type 'System.Data.Linq.DataQuery`1[[DynamicQueries.VW_EmployeeProfile_Filter, DynamicQueries, ersion=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' in Assembly 'System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable
what should i do to get rid of this error. previously i was doing like this:
Private Shared _Query As IQueryable
but problem is that in Multi users environament, Shared variable is making problem, that is why i want to store it in ViewState.
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Aug 6, 2010
Why to Serialize an object to store in ViewState?
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Jul 27, 2010
I have a class called EditMapUtilities. Here are some class properties that I want to persist:
public class EditMapUtlities
{
public static Boolean isInitialEditMapPageLoad
{
get { return SessionHandler.isInitialEditMapPageLoad; }
set { SessionHandler.isInitialEditMapPageLoad = value; }
}
// REST OF CLASS NOT GERMAIN TO DISCUSSION AND OMITTED
}
Here is my SessionHandler Class following the pattern from this post Static Session Class and Multiple Users:
using System.Web.SessionState;
public static class SessionHandler
{
private static HttpSessionState currentSession
{
get
{
if (HttpContext.Current.Session == null)
throw new Exception("Session is not available in the current context.");
else
return HttpContext.Current.Session;
}
}
//A boolean type session variable
private static string _isInitialEditMapPageLoad = "EditMapInitialPageLoad";
public static bool isInitialEditMapPageLoad
{
get
{
if (currentSession[_isInitialEditMapPageLoad] == null)
return true;
else
return (Boolean)currentSession[_isInitialEditMapPageLoad];
}
set
{
currentSession[_isInitialEditMapPageLoad] = value;
}
}
}
I am still learning OOAD. I want to keep relevant properties with relevant classes. I also want to keep all Session stored variables in one place for ease of maintenance and to encapsulate the session keys and calls. I feel like my design is too coupled though. How can I make it more loosely coupled? Is my editMapUtilities class too tightly coupled to the SessionHandler class? How would you do it better?
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Oct 8, 2010
How do you store multi-dimensional array to viewstate? Here's what I did:
public bool[,,] regsettings = new bool[7,5,4];
bool[,,] regsettings = (bool[,,])ViewState["regsettings"]; // this line works!
regsettings[i,j,tab] = (bool)ViewState["regsettings"]; // this line no working?! The error is: Object reference not set to an instance of an object. The letters i,j, tab are just variables in the loop. They are there. I also tried: (bool[,,,]) as a cast and it is a no-go either.?
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Jul 7, 2010
The Title pretty much says it all but to clarify more I have a page with private properties that are storing a credit card object and a shopping cart object in viewstate so I can maintain a reference to them across postbacks. BTW the page involved will be using ssl. Is this safe?
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Sep 8, 2010
I've build a class like this:
[code]....
The values of this class are set at postback by clicking a radiobutton list. Problem however is I don't know how to save this values across multiple postbacks. I thought of using viewstate but I'm not quite sure how to do it with this class.
Maybe I'm missing some important thing here.
Hope someone can point me in the right direction.
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Apr 14, 2010
In my website the page viewstate values in hidden are very large.So i wish to store this values into another methods(session,files etc).so please advice me to some methods..
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May 15, 2010
I have a public property that I use to store a GUID in the viewState:
Property myGUID()
As
Guid
Get
Return
CType(Me.ViewState("myGUID"),
Guid)
End
Get
Set(ByVal
value As
Guid)
Me.ViewState("myGUID")
= value
End
Set
End
Property
I include this code on many pages in my website...is there any way to migrate this to a common code file, so I don't have to repeat it on each page? If I try to add it to a class file, the "Me" part of course is out of scope.
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Feb 6, 2011
My code is:
[code]....
When I run the program, an error occurs:
Unable to cast object of type 'System.Collections.Generic.List`1[System.Int32]' to type System.Int32[]'.
Why does this error occur?
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Jul 17, 2010
i have deployed my website on a particular server. i have some limitations in using viewstate and session variables. those pages in which i have used ViewState variables (for storing some information), i user accesses that page and does not do any activity for 5 minutes and if after 5 minutes he does any kind of activity (click on Link or button etc) then he receives following error: "Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster."
how i can avoid above error? another problem is with session. My session expires just after 2-3 minutes. What should i do for maintaining session for long time? i can not use cookies, as if user has disabled the cookies then my website will not work...
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Jul 17, 2010
i have deployed my website on a particular server. i have some limitations in using viewstate and session variables.
those pages in which i have used ViewState variables (for storing some information), i user accesses that page and does not do any activity for 5 minutes and if after 5 minutes he does any kind of activity (click on Link or button etc) then he receives following error:
"Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster."
another problem is with session. My session expires just after 2-3 minutes. What should i do for maintaining session for long time? i can not use cookies, as if user has disabled the cookies then my website will not work...
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Feb 5, 2010
I am designing a site with that requires users to login in to access info. How do I save the user name and password in viewstate or session. so I can use it in other pages later.
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Oct 1, 2010
i have two text boxes and one button in web form. I need to display the contents of text boxes in a datatable in the same form, when i click on the button.
How can i do this using session array. I need to store values in session array. and get back the values from session when i need .
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Jan 8, 2010
can we access viewstate and session objects at unload event of page.
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Jan 30, 2014
if my website when session of user expire i get the following error.
Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
My website is in vs3.5
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Nov 22, 2010
Currently in an .aspx file, I am storing a value (filename that was created in that session) in an hidden text box. When the user clicks on the "Print" labeled Hyperlink control, it opens the file that was stored in the hidden text box control. But when the user goes to different screen (in the same session), I loose the filename value that is stored in the hidden text box control. So I would like to store the filename variable in a session variable. So that if the user leaves this .aspx file and comes back to this .aspx file I can load the value into the hidden text box from the session variable.
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