MVC :: Storing State In 'TempData' When Performing The PRG (Post-Redirect-Get) Pattern?
Jul 29, 2010
I'm learning about storing state in 'TempData' when performing the PRG (Post-Redirect-Get) pattern. It says TempData stores session state on the server. I'm wondering if this is safe or unsafe in a load-balanced server farm?
Are there precautions to be taken with TempData? Or can we happily program against it with abandon. Just wanting to avoid the frights we all got with the Session back in the day with ASP.NET of old.
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Feb 23, 2010
Does anyone have a working pattern for converting a GET-POST-GET pattern to asny?
I'm encountering the following issues:
1. You cannot mix Sync and Async action methods SubmitForm(), SubmitFormAsync(bool? confirm), SubmitFormCompleted() ... (because the resolver gets all confused ... it doesn't use the HTTP verb to decide who to target. BTW: I think that's poor design, or a bug)
2. Renaming the get method name to something else eg: SubmitFormConfirmation(), SubmitFormAsync(bool? confirm), SubmitFormCompleted() would be very awkward if it works ... because you have to doctor the <form markup to specify an action name.
3. You cannot give them all async names SubmitFormAsync(), SubmitFormAsync(bool? confirm), submitFormCompleted(), because the call just keeps malfunctioning. It sometime even behaves as if you are requesting a delete of something.
Can someone give an insight from an actually working sample.
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Aug 24, 2010
I'm trying to implement Redirect After Post for the first time in ASP.NET. Assuming my business objects may take several seconds to a minute to complete, in what order, and what syntax do I use?
For example:User POST's
Server issues Server.Transfer or Response.Redirect
Server does something that takes a minute or two Thread.Sleep
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May 21, 2010
I am working with ASP.net MVC 2 framework, for multiple sites. We have a base site and then sub sites that inherit from a "Core" site that contains 90% of the functionality that the sub sites will use.
In one of the controllers, I am saving some data, adding a UI message to the tempData and then using Response.Redirect.
The redirect works, but the tempdata is empty after the redirect.
I have tried returning "RedirectToAction" and "RedirectToRoute" with the same routing location and while it populates the TempData, the redirect doesn't happen lol..
So I guess in short, is there a way to get tempdata working when using a standard Response.Redirect?
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Jul 13, 2010
I have created a utility method that contains some try/catches in it. In those try/catches I need to redirect the customer using an HttpResponse redirect. I can't seem to figure out how to do this outside a web project. This utility class is referenced from my ASP.NET web project and so I'm just abstracting out some of the code into this utility class so I no longer have the request object.
I know I can use HttpWebRequest object for a lot of web related request tasks outside a web project, but could not seem to get any redirect method there to use after putting in a using System.Net; in my utility class.
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Nov 9, 2010
I am trying to set up a POST from one aspx file to another progromatically. Inside the POST is a String of XML data which i have properly added to Server.HtmlEncode(). For some reason, when I grab it in my logs on the other page, it is showing with 3 question marks. I at first thought it was logging text i left somewhere, but have narrowed it down to a Encoding error of some sort because when i change the encoding it changes the character, and when I just put some text in there, i see it on the other side fine. i have tried UTF 8,UTF32,Unicode,ASCII... Can't seem to find the right combination. Can't find the UTF-16
when I use the Encoding object
Below is my Code:
[Code]....My Sending Debug log has the Extension xml coming out in HTML format correctly before POST. Below is just a piece of it[Code]....
And then on the other side log I get the below
Extensions =??
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May 3, 2010
I have the following setup:
[URL]
[URL]
Each virtual directory is configured on IIS6.0 as an application with own AppPool.
When redirecting authenticated user from dir1 to dir2 using response.redirect I lose authentication information for the user and the user is being redirected to the login page. This issue was not coming up with each app (dir1 and dir2) were configured under subdomain, ex: [URL]
I have resolved the issue by adding a machine key to the machine.config file.
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Aug 11, 2010
In the web app (C#, ASP.NET) I am working on at the moment, the value in Request.Headers["Referer"] can determine things like custom style. I have created a custom page with a drop down menu to test this functionality. So when the selected index changes, the value selected should be set in the Request.Headers["Referer"] then will be redirected (Response.Redirect), the receiving page will then pick up the value in Request.Headers["Referer"] and adjust the styling accordingly. However I haven't been able to set value for Request.Headers["Referer"]. Is it possible at all?
Website 1 sets the value in Request.Headers["Referer"], e.g. www.xyz.com and before doing Response.Redirect to www.website2.com
Website 2 picks up value in Request.Headers["Referer"], in this case www.xyz.com and do what it needs to do, i.e. styling etc.
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Sep 18, 2010
We have a scenario where we need to store large tables of data on Session in asp.net page. on a highlevel we have to store following data
1> A table (table 1) with 1000 rows and 8 to 10 columns.
2> A table(table 2) with 500 rows and 8 to 10 columns (actually user can add the data from table 1 to table 2, so as user keeps on adding from table 1 we remove the data and put it in table 2)
3> Another table(table 3) with 1000-1200 rows each having 3 columns.
We are having a webfarm, so we need to store it in either SateServer of Oracle DB,What would be the performance implications of storing such huge data on the server.
One more thing is at any point of time max of 70 -80 people will be accessing our website, so will this cause any performance degradation?
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Sep 7, 2010
asp.net 4.0
I wonder what the Regex pattern for session id is?
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Jun 1, 2010
I've begun building a bit of a framework that I wouldnt mind working with. The idea is to create a framework that makes it even easier to create CMS addons (So basically a CMS framework).
One of my goals with this project, was having all modules made within the framework automatically support version without any extra coding.
More to the point, the way that I started building this, many pieces (Lots had to do with the versioning system) became interlinked. A version Object in the code related directly to a Module Object and vice versa, therefore the class definitions for each relate to eac otherh. (So having only the Module object, i could access the versioning object and all of its properties). My issue with this is of course what happens if i have both the module and versioning objects in my code simoultaneously, resulting in having not just duplicates of the data within the code, but (perhaps) infinite amounts, killing the app.
So what im wondering is, what if my modules properties where stored within the cache? Ie if i had the Module object, and it had the property ID -- Then the data for ID would be stored in the cache within the module object. Referencing the value simply retrieves the value from the cache if it exists there, and the SQL database if it doesnt. This way, all instances of the module that may be running at the same time will have access to the same information, at the same time, and hopefully causing it to use less space in total.
I would then add a function, so that if a developer was loading a rarely used module, or dident want to occupy cache space with large amounts of data, then they could just call a Dispose function that would remove the data from the cache.
Does this method sound reasonable? I know this probably isnt what the cache is designed for -- but I cant think of any other way to do this without having an infinite loop of objects referring to each other, or causing huge discrepencies from having different instances of objects referencing values that should be the same, but arent because they are technically different instances.
[Code]....
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Apr 6, 2010
I am developing questionare web site, where user has to answer around 55 questions. Its basically a check / uncheck option. So when user submit I store the value in DB.
The issue I am facing is if user selectes all the option, cookie value is lost. I see only 50 records can be stored (Request.Cookies.AllKeys)
Even the SessionID value is lost.Any solution / work around.
I need to store in the client side only. because if the user choose all options and do not submit. The values can be stored in the cookie and later point if he comes back we can read and give to him
ASP.NET / C#
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Nov 11, 2010
anybody tell me how can i check session is storing value or not?
actully i am using first time session variable to store datatable gridview but do't know that is saving value or not actully in my grid when user inser first row entry then it is ok when click on new row button then new row generate but previous row value lost.
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Aug 28, 2010
I have written a property globally on page load i am storing setting some value into that property but on button click i am not able to retrieve the data. Is there any alternate way to save the data other than viewstate or sessionstate. Ex:
Partial Class _Default Inherits System.Web.UI.Page Private s As String Public Property Test() As String Get Return s End Get Set(ByVal value As String) s = value End Set End Property Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then s = "Test" End If End Sub Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click s = "Champ" End Sub Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click MsgBox(s.ToString()) End Sub End Class
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Oct 28, 2010
I am storing Datatable in Session variable in my project. Is it good practise to do so? The datatable has 20 fields and can run into 1000+ records. Will it hamper my application performance?
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Feb 10, 2010
I am using master page.
(1) to maintain the state of the treeview without storing it in session or view state or
(2) I am binding the treeview control dynamically from a xml. Even if I use session state is ther any option to use it without using SelectedNodeChanged event because when u click the treeview node , first master page will postback for this event and then the child page and then again the master page will post pack (as the child page has inherited the master page). So here in this case we are posting the master page twice and it is reducing the performance.
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Jun 3, 2010
get the list of all sessionid which will be running onto server without storing them anywhere.
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Apr 14, 2010
I am having two aspx pages(Page1.aspx,Page2.aspx).I am stioring values in Session in Page1.aspx and retriving the same values from Page2.aspx.But if the session value is null I am getting an error as 'Object reference not set to an instance of an object.'Here is my code..
[Code]....
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Nov 29, 2010
I am writing a web page that returns a small volume of data from a database table. The database is polled every 1 second and the data will be the same for every user. As every user is accessing the same data, there is no need for each user to poll the database and use up db resource.
Therefore, I think I should be using application caching to store the data in a dataset. However, I am slightly stumped as to how to do this.... because how can i ensure that the dataset is kept up to date.
The only way I can think to do this is to have a master user/session (i.e. the first session in the application) that keeps the cache object updated every second, then other users can use that cache object. If the first session ends, then the next requestor of the cache will pick up responsibility for keeping the dataset up to date.
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Nov 23, 2010
I am using asp.net mvc 2.0 to implement shopping cart application.My situation is , I have a order page, there i am adding the products to the Cart.Below it will show the Cart total.Next i will go to the shopping cart page to delete or editing the items.In this page it will show the same cart total as in the Order page.
But once again if i go back to the Order page to order some more products to the cart,the cart total in the order page is showing 0 amount. This is my Shopping cart controller action method,
public ActionResult ShoppingCart(int eventID)
{
Event e = eRepository.GetEvent(eventID);
var cart = Stalbans.Models.ShoppingCart.GetCart(this.HttpContext);
[Code]....
So once i will go to the shopping cart page from the order page and again coming back to the order page it has to show the same cart total. Actually data is persisted in the cart total but it is not showing .Because if you add one more item its amount will added to the existimng cart total and then shows the current cart total. So for the first time i click back at that it has to show the already existed cart total in the cart total value.
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Oct 13, 2010
We have an ASP.NET MVC site that uses Entity Framework abstractions with Repository and UnitOfWork patterns. What I'm wondering is how others have implemented navigation of complex object graphs with these patterns. Let me give an example from one of our controllers:
[code]....
It's a registration process and pretty much everything hangs off the POCO class Person. In this case we're caching the person through the registration process. I've now started implementing the latter part of the registration process which requires access to data deeper in the object graph. Specifically DPA data which hangs off Legal inside Country.
The code above is just mapping out the model information into a simpler format for the ViewModel. My question is do you consider this fairly deep navigation of the graph good practice or would you abstract out the retrieval of the objects further down the graph into repositories?
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Mar 1, 2011
I'm interested in implementing PRG in my website for some forms I've created. At present they postback to themselves, and obviously refreshing these pages posts the data in duplicate. Can anyone point me in the direction of a good tutorial of how I can code this into my site? I understand the logic but am not sure exactly where to start.
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Jul 6, 2010
I have a user registration form. Here I have link to another page (card info page) which has to be filled for the registration. User fills the few fields in the user registration form and click on the link that takes to card info page. When user clicks the link in card info page to navigate back to registration page, the previous details entered in registration got vanished. So I need to redirect from card info page to registration page without postback. How can i accomplish that?Response.Redirect() is used for redirection.
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Oct 27, 2010
I have heard alot about sql injection and how it is normally caused. Mostly sql injection in my opinion is caused through search boxes. Now my question is quite simple. Is it advisable to store the search keyword in a session variable to prevent sql injection? I don't want to expose the keyword through the querystring as it is prone to attacks. So in short there is no harm in using session variables to store the keyword right?
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Oct 18, 2010
I have a gridview and a checkbox. I am able to pass the checkbox id to a textbox in the same page. This is then passed as a session variable. However, when I place an option to page and select the checkbox items in the next page, the session variable resets.Please see below code, how do I store "all checkbox" throughout all paging and store it in the session page?
[Code]....
Behind code VB:
[Code]....
[Code]....
[Code]....
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