C# - Invalidating The HTTP Cache On Read Only Front Servers?
Mar 24, 2010
We have a CMS system and in the production mode a number of servers only have read-only access to the content (with a few exceptions) and the editors for the site work on the content on servers behind it (which are not available to the public).
We're caching the content quite a long time on the front servers, but sometimes we want the content the editors publish to be available for visitors instantly. What is best practice for invalidating the cache in those cases?
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Feb 9, 2010
I think it is a problem that SqlCacheDependency may invalidate a cache item while it is being set:
function getCacheItem()
if cacheitem is empty
cacheitem = something
AND AT THIS POINT SqlCacheDependency INVALIDATES THE cacheitem
end if
return cacheitem
end function
how can we prevent this? Is it somehow possible to specify a ReaderWriterLockSlim for the SqlCacheDependecy to use?
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Feb 25, 2011
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Nov 10, 2010
We have a web application that is storiing all site data in HttpRuntime.Cache. We now need to deploy the application across 2 load balanced web servers. This being the case, each web server will have its own cache, which is not ideal because if a user requests data from webserver1 it will be cached, but there next request might go to webserver2, and the data that their previous request cached won't be available. Is it possible to use a shared-cache provider to share the HttpRuntime.Cache between the two web servers or to replecate the cache between them, so that the same cache will be available on both web servers?
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Jul 23, 2010
We are working on a web application that is distributed across 3 load-balanced web servers. A lot of the data we retreive via NHibernate is stored in System.Web.Caching.Cache.
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Mar 11, 2010
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Mar 22, 2011
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[Code]....
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Aug 19, 2010
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Mar 3, 2011
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[Code]...
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Mar 9, 2010
how do you create a class to read the html body and phase it into a variable?
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in this case
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Nov 16, 2010
I am trying to set up my web site on a stand alone server using Windows Server 2003 with IIS 6 which will access SQL server database (2008) on windows 2008 R2 server (also not in the domain) I am using form authentication and I have configured a custom identity account in IIS6. The local account is on both servers with same password and I have registered the account using aspnet_regiis.exe -ga The application pool in my iis6 has the custom local account set as the identity and my web.config file has the appropriate tags in the system.web element <identity impersonate="true" />
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Nov 9, 2010
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excuse me for the underlines, i thought that would make my query stand out.
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Oct 6, 2010
I've tried to write my own HttpModule (IHttpModule) that adds a Header like that:
public class MyModule: IHttpModule
{
public void Init(HttpApplication c)
{
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public void Dispose(){}
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Jul 23, 2010
I have a very simple query. I have added custom header to my website. Now I want to read the custom header. I am using IIS 6.0 on windows XP. I have already tried using using the Request.ServerVariables and and Request.header method. But none of them give me the custom header added to website.
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Oct 5, 2010
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Feb 22, 2010
I would like to read all content that's been written to the output stream. I'm attempting to do this using an HTTP module, and it seems like the obvious timing would be when handling the PreSendRequestContent event.
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Nov 21, 2010
Is it possible to validate a user's Username + Password without logging them in? I understand a usual login block will look like this:
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With the Membership.ValidateUser() call setting the cookie for the response.
However, there are some additional checks I'd like to perform after the password is confirmed. (Pulling out an expiry date for that user, for example).
Is there a way to do it without just calling FormsAuthentication.SignOut(); after invalidating the page?
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Dec 9, 2010
I'm having a problem trying to delete the form authentication ticket (.ASPXAUTH) from the server side. It would be the same to delete or invalidate the ticket so the client could not reuse it.
So far, the only solution I've found is to delete the ticket from the client side (through a "Set-Cookie: .ASPXAUTH=;") but nothing seems to be implemented and/or working for doing so in the server side. The final idea is that if someone steels that ticket
In particular, I'm working in C# but as it's rellated to the Dotnet Framework any implementation of the solution would be OK; I tried all the possible things and nothing worked out, even invalidating the session but nothing.
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Mar 29, 2010
Is it correct to implement my caching object like this in my controller :
[code]....
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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:
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[code]...
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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";
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[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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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:
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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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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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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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