C# - Force All Cache To Expire?

May 21, 2010

Is there a method or something to force the expiration of all of the entries in the Cache collection of the HttpContext?

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Unable To Force A Page To Always Expire In Safari

Aug 2, 2010

I'm unable to force a page to always expire in Safari. Chrome, IE and Firefox are good citizens but Safari is cruising along just fine with ignoring the following ASP.NET code:

// Expire immediately
Response.Expires = 0;
Response.Cache.SetNoStore();
Response.AppendHeader("Pragma", "no-cache");

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Cache Didn't Expire After A Minute

Mar 24, 2010

This the code.

Cache.Insert(txtUserName.Text.Trim(), 1, null,
DateTime.Now.AddMinutes(1),
TimeSpan.Zero);

But Cache didn't expire after a minute.

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.net - Force HttpWebRequest To Use Cache In Asp Environment?

May 13, 2010

In my ASP.NET app I use HttpWebRequest for fetching external resources which I'd like to be cached. Consider the following code:

var req = WebRequest.Create("http://google.com/");
req.CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.CacheIfAvailable);
var resp = req.GetResponse();
Console.WriteLine(resp.IsFromCache);
var answ = (new StreamReader(resp.GetResponseStream())).ReadToEnd();
Console.WriteLine(answ.Length);

HttpWebRequest uses IE cache, so when I run it as normal user (in tiny cmd test app), data is cached to %userprofile%Local SettingsTemporary Internet Files and next responses are read from cache.

I thought that when such code is run inside ASP.NET app, data will be cached to ...ASPNETLocal SettingsTemporary Internet Files but it is not and cache is never used.

What I am doing wrong? How to force HttpWebRequest to use cache in ASP.NET environment?

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How To Force Client Browser To Download Images From Server Rather Using Its Cache

May 20, 2010

Assume a simple aspx data entry page in which admin user can upload an image as well as some other data. They are stored in database and the next time admin visits that page to edit record, image data fetched and a preview generated and saved to disk (using GDI+) and the preview is shown in an image control.

This procedure works fine for the first time however if the image changes (a new one uploaded) the next time the page is surfed it shows previously uploaded image. I debugged the application and everything works correct. The new image data is in database and new preview is stored in Temp location however the page shows previous one. If I refresh the page it shows the new image preview. I should mention that preview is always saved to disk with one name (id of each record as the name).

I think that is because of IE and other browsers use client cache instead of loading images each time a page is surfed. I wonder if there is a way to force the client browser to refresh itself so the newly uploaded image is shown without user intervention.

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Web Forms :: Display Session (Timeout) Expire Message 5 Seconds Before Session Expire

May 7, 2015

Using this code i want to show an modal pop up to the user that "your session will be expired within 5 minutes , Click here [BUTTON] to reset your session" , here's my code :

<asp:Button ID="btnReset" Text="Reset" runat="server" OnClick="ResetSession" />
<br />
Your Session will expire in <span id = "seconds"></span> seconds.
<script type="text/javascript">
function SessionExpireAlert(timeout) {
var seconds = timeout / 1000;
seconds--;

[CODE]...

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C# - Implement System.Web.Caching.Cache Object In A Controller To Cache Specific Query?

Mar 29, 2010

Is it correct to implement my caching object like this in my controller :

[code]....

And I Use it like this :

[code]....

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Architecture :: Cache The Full List Of Objects In Http Cache On The Service Tier And Page In Memory?

Feb 25, 2011

We have a wfc layer that wraps the business classes and database access and use a client that lives on the database layer. Amongst our group we are attempting to form standards. Some want to have the client call the web method and pass the page they are requesting and the page size. Pass that to the database and then page in SQL Server use RowNum.Some want to cache the full list of objects in http cache on the service tier and page in memory. They concern here is memory use on the server.

Which would be best for a medium number of users with potentially large number of records to manage (say 30K) Is it better to cache them all in memory and work from there or page at the database as the application scales?

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New-Cache Parameters For AppFabric Cache When Storing.NET Session State

Jul 28, 2010

What are the "optimal" parameters for creating an AppFabric cache when you will be storing session state in the cache? MSDN Cache-Related Commands

Powershell command line:

New-Cache [-CacheName] <String> [-Eviction <String>] [-Expirable <String>] [-Force [<SwitchParameter>]] [-NotificationsEnabled <String>] [-Secondaries <Int32>] [-TimeToLive <Int64>]

[code]...

Since I don't want my sessions to be removed unless the session has been abandoned either via code or Session Timeout...For eviction, I would think "None" and for expireable, I would think False.I have tested and calling Session.Abandon does remove the object from the cache. I have also tested to see if by extending my session, the session object in cache is also extended. This does seem to work the "correct" way.

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Data Cache Support Background Population Of Cache Entries?

Aug 1, 2010

We have a data driven ASP.NET website which has been written using the standard pattern for data caching (adapted here from MSDN):

public DataTable GetData()
{
string key = "DataTable";
object item = Cache[key] as DataTable;

[code]...

The trouble with this is that the call to GetDataFromSQL() is expensive and the use of the site is fairly high. So every five minutes, when the cache drops, the site becomes very 'sticky' while a lot of requests are waiting for the new data to be retrieved.

What we really want to happen is for the old data to remain current while new data is periodically reloaded in the background. (The fact that someone might therefore see data that is six minutes old isn't a big issue - the data isn't that time sensitive). This is something that I can write myself, but it would be useful to know if any alternative caching engines (I know names like Velocity, memcache) support this kind of scenario. Or am I missing some obvious trick with the standard ASP.NET data cache?

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C# - Maximum Length Of Cache Keys In HttpRuntime.Cache Object?

Feb 24, 2010

We are using HttpRuntime.Cache API in an ASP.NET to cache data retrieved from a database.

For this particular application, our database queries feature a LOT of parameters, so our cache keys look something like this:

table=table1;param1=somevalue1;param2=somevalue2;param3=somevalue3;param4=somevalue4;param5=somevalue5;param6=somevalue6... etc...

we have so many parameters that the cache key is several hundred characters long. is there a limit to the length of these cache keys? Internally, it is using a dictionary, so theoretically the lookup time should be constant. However, I wonder if we have potential to run into some performance/memory problem.

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ADO.NET :: Use HttpContext.Current.Cache (system.web) For Cache Data Something In Project

Sep 13, 2010

I have use Nhibernate in my MVC Project by me known, Nhibernate have cache on Session and Object. now, I want use HttpContext.Current.Cache (system.web) for cache data something in project. my code same that have problem, haven't it. and that's right or wrong.

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Architecture :: Distributed Caching / Keeping Cache In Sync Between Multiple Webservers Or Even Better Farm Cache Management To Another Server?

Feb 26, 2010

I've got a web application that runs of a state server. It looks like soon it may need to distributed and there will be two web servers behind a load balancer.

This works great for session state but my next challenge is Cache

My application leverages heavily of cache. I understand ASP.Net 4.0 will be offering more here but nothing much has been said about the how too.

There are two challenges that I face

1). Each webserver will have its own copy of cache whereas it would be more efficient to put this to a third server the same as session state is put to state server.

2). The real challenge is keeping cache in sync if a simple dataset derived from the database is changed my code dumps that cache item and reloads the cache. That's all well on one webserver but webserver number two wont know to drop that particular cache item and reload it. This could cause some unexpected problems in the application.

For scenario number 2 I could attempt to do some smart coding so server number two knows to dump the cache and reload it.

My guess is someone else has already been here before and there's probably a better implementation approach rather than writing extra code.

Does anyone know how I could achieve the goal of keeping Cache in sync between multiple webservers or even better farm Cache management to another server?

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Is Page Output Cache Stored In.NET Cache Object?

Nov 2, 2010

I need to enable caching in my asp.net application, but I do not want to use the webserver's memory for holding cache objects. If I add the page directive for output caching will the page be stored in the asp.net cache object?

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C# - Application_End() Cannot Access Cache Through HttpContext.Current.Cache

Dec 12, 2010

I want to be able to maintain certain objects between application restarts.

To do that, I want to write specific cached items out to disk in Global.asax Application_End() function and re-load them back on Application_Start().

I currently have a cache helper class, which uses the following method to return the cached value:

return HttpContext.Current.Cache[key];

Problem: during Application_End(), HttpContext.Current is null since there is no web request (it's an automated cleanup procedure) - therefore, I cannot access .Cache[] to retrieve any of the items to save to disk.

Question: how can I access the cache items during Application_End()?

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C# - Web Application Cache Versus Database Cache

Jan 14, 2010

Im building a image gallery which reads file from disk, create thumbnails on the fly and present them to the user. This works good, except the processing takes a bit time.

I then decided to cache the processed images using the ASP .NET Application Cache. When a image is processed I add the byte[] stream to the cache. As far as I know this is beeing saved into the system memory. And this is working perfect, the loading of the page is much faster.

My question is if there are thousands of images which gets cached in the Application Cache, will that affect the server performance in any way?

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Sql - Cache And Output Cache For Controls?

Oct 28, 2010

You know I have the way to Cache the data I've got from the SQL Server over data caching. In addition I can output cache web user controls.Whats about a web user control contains data from a SQL database? Does it make sense to cache the data and also cache the control?What is the best solution for the combination of these two components?

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Set Cookie To Expire At End Of Session?

Sep 17, 2010

I'm surprised i couldnt find any answers.

How do i set my sessionid in my cookie to expire at the end of session? (when the browser closes or the user has been inactive for a period of tie).

The two solutions i found were

(httpcookie).Expires = HttpContext.Current.Session.Timeout

Which gave me a compile error so i dont know if the user checked his code before posting. And the other was to set the expire date to 1 day ago which my gut says is wrong. How do i do this?

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How To Set Cookie Expire Time In C#

Jan 27, 2011

How do I set cookie expiration time in C#?

I want cookies to expire when the browser is closed. I found in many blogs that giving a previous date as the expiry date will cause the cookie to automatically expire, but that is not working in my case.

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C# - Session Expire If Not In Idle?

Jul 10, 2010

im getting problem with session, when i'm not idle and still using webpage thes session expires I am using VS 2005

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Iis - Session Won't Expire / Finding Its Cause

Jul 27, 2010

I have the following in the web.config

<sessionState cookieName="ASP.NET_SessionId" cookieless="false" mode="InProc" timeout="1" regenerateExpiredSessionId="true"/>

however, after 1 min, the session won't expire.what can cause this?

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C# - ApplicationState Expire Like SessionState

Dec 22, 2010

There is a timeout for Session object of HttpSessionState that can be set. I want to see if we can make HttpApplicationState timeout too?

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Custom Server Controls :: How To Programmatically Cache A Server Control And Add A Cache Dependency?

Feb 11, 2011

I have a server control that I developed which generates navigation based on a third party CMS API. Currently I am caching this control using the PartialCaching attribute. The CMS uses cache key dependencies to invalidate the cache when a user makes an edit, however in the case of my server control it does not get invalidated and the updated navigation will not show up until the cache expiration set by the PartialCaching attribute.Here is my two part question:

What is the proper way to programmatically cache a server control, without using the PartialCaching attribute, and adding a cache key dependency?

Is it possible to continue to use the PartialCaching attribute and add a cache key dependency?

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VS 2008 Want That Session Will Expire In One Hour

Apr 22, 2010

I want to increase the session time,By default the session will expire in 20 minutes,I want that session will expire in 1 Hour,Hw to to dat?

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Iis7 - Set Image Expire Date?

Jan 30, 2010

Using asp.net in visual studios and IIS7 when i get a host.

I have a folder full of icons that will rarely change and is used on every page. Is there a way i can set a certain directory to expire something like once every 2 or so hours so i can decrease the amount of incoming request to the server?

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