I am creating a graphical tool in silverlight which reads data from multiple files and database.
i dont want to call the database again and again. i want to retrieve the data when required and keep it safe somewhere so if the user or any other user visits the same page, they can then access the data.
i want to use application state of asp.net Cache["Object"] but in Silverlight? what is the best methodolgy?
My Silverlight4 app is hosted in ASP.NET MVC 2 web application. I do web request through HttpWebRequest class but it gives back a result previously cached. How to disable this caching behavior? There are some links which talks about HttpWebRequest in .NET but Silverlight HttpWebrequest is different. add unique dummy query string on every web request, but I'd prefer more elegant solution. I also tried the following, but it didn't work:
_myHttpWebRequest.BeginGetRequestStream(new AsyncCallback(BeginRequest), new Guid());
In fact, by setting browser history settings it is possible to disable caching. See the following link:
[URL] But asking a user to change browser settings is not an option for me.
Is there an easy way to cache ASP.NET whole page for anonymous users only (forms authentication used)?
Context: I'm making a website where pages displayed to anonymous users are mostly completely static, but the same pages displayed for logged-in users are not.
Of course I can do this by hand through code behind, but I thought there might be a better/easier/faster way.
I'm developing an application using ASP.Net.
For first the idea: "My WebApp needs an chronometerto be shared by users and all users will se the same value in cronometer. When a user clicks on a button, the cronometer needs to be restarted and all users will need to see that!"
All right, now I'd like to know what's the best choose to improve more performace an make sure that all users will see the same value in chronometer?
Need I use JSon (with jquery in client side), Timer with UpdatePanel of Ajax Extensions, pure Ajax (with JQuery) how to shared a cronometer for all users in C# (put information in Cache or database) ?
i'm developing a "small" warehouse-management WebApplication for few users(5-10 parralel) but with a complex authorization system(checking if pages,menus,TabPanels, UserControls and even single controls are visible or enabled) and permanent and frequent access. Because i've only limited experiences with the ASP.Net MembershipProvider, i'm unsure what's the best approach for following goal:
I want to hold all users, roles and frequently used masterdata in the Cache(in a Dataset). Hence every readonly access should be faster and causes less traffic than always using the database. On updates,deletes and inserts i would update the cached dataset and also the database.Can i use or extend the SqlMembershipProvider to achieve this goal and if possible how?Should i use the stored-procedures from asp.net or simply use the standard CreateUser, GetUser, DeleteUser-functionality? Does this approach makes sense at all?
I have an ASP.Net 4.0 web application which very frequently loads data from the database and does heavy calculations on it. I want to cache this loaded and prepared data in a central cache that can be accessed by every user and computer who uses the application.
Simple use-case:
User 1 accesses webpage, cache is empty, data is loaded/calculated, data is cached
User 2 accesses webpage, cache contains data, data loaded from cache
User 3 accesses webpage, cache contains data, data loaded from cache
User 1 reloads webpage, cache contains data, data loaded from cache
Cache expires
User 3 refreshes webpage, cache is empty, data is loaded/calculated, data is cached
I know that ASP.Net has a built-in cache mechanism. What I don't know is whether it can be shared between different users accessing the site on different computer at the same time. I would also like to know how the system behaves in a web farm environment.
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?
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.
View 2 RepliesThere are subdomains: sub1.domain.ru, sub2.domain.ru, sub3.domain.ru, sub4.domain.ru. On default page there is a code:
protected void Page_Load(object sender, EventArgs e)
{
string subdomain = Cache[key] as string;
if (subdomain != null)[code]...
Will users see their subdomain name in different subdomains(sub1.domain.ru, sub2.domain.ru, sub3.domain.ru, sub4.domain.ru) ?
Is it correct to implement my caching object like this in my controller :
[code]....
And I Use it like this :
[code]....
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?
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.
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.
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?
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?
View 2 RepliesI 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()?
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?
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?
View 1 RepliesI 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?
I use Silverlight 3 and .net framework 3.5. I want to send xml data to server on click of a button. On googling i found that we can use WebClient Class's UploadStringAsync method.
I am posting data to a web service running under local IIS. All that is fine but how do i capture the data posted on the service?
I'm developing chat application. I use flash as front end and asp.net back-end. My question is: can my asp.net web app send data to flash app in browser without post back ?actually it mean asp.net push data to flash client. I don't know much about flash or siverlight, dose flash support to do that ? or other way help me connect direct from server to browser without using post back or Jabber ?
View 4 RepliesI want to send data from my silverlight application to a aspx page. But i don't want to pass parameter in the url when calling the aspx page.
So i figure the best way is to do a POST. But i'm not too sure how to do it..
I am new to silverlight and I am wondering if it is possible to access silverlight object data from the aspx page that host it. Or have silverlight write to a hidden field on the page on client side.
What I am trying to do is to use silverlight to upload file via WCF (client to WCF Service directly instead of posting data back to the web server then forwarded to WCF service). When uploading a large file, user can still do some data entry etc. And once the upload is done have it write some data return by the WCF service to the aspx's hidden field and postback to the server on submit.
So part of my web app centers around this very important form which is used to create a form. Its like google docs form. The user keys in a type (checkbox, textfield, numericfield) and a label and slaps it into the system, and it generates a form somewhere.
Its a little more complex than google forms, the field types are complex and theres a lot more to that form (It happens to be a form generator for a finance plan)
The app is asp.net, I was thinking of using jquery and jquery's own ajax methods to post the data, but I think it would just turn into a very hairy situation, I then thought silverlight, but Ive never done silverlight before but I am an experienced .net guy.
So what do you guys think, will silverlight be too tough for a first timer for this kinda thing? Or should I stick to jquery. Plus points for silverlight is its an inhouse lan app and this particular page will be used by people with very high bandwidth.
Also I'm on .net 4 btw.
the initial data load for the Silverlight app, can take 6 -20 seconds. We are using web service, data is coming from one database and loads 2 years worth of transactions. We don't use summary tables. we are not doing insert/update/delete, just display.
View 4 Replies