How can i send emails automatically every day by asp.net application and c#?
Your best bet is to use a Scheduler like Quartz.NET. It will give you the most precise, flexible, and predictable results.
ASP.NET application cannot run scheduled code. It works on simple request response pattern so it can run the code only if HTTP request arrives. To do the scheduling you have to write another application. Ugly way is to use console application and schedule it by Windows scheduler. Better approach is to use windows service.
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I have a web api that's running 24/7 on LAN(due to data security reasons, it's not connected to the internet). I have to call one method inside it each morning around 07:00. I've read that Timers are not reliable. I do not own the server so I don't have access to the Task Scheduler. How can I achieve this?
Do you think I should tell them that I have to install the software? Would they let me use the Task Scheduler? Is there any way to do this without the Task Scheduler?
There are a couple of options that you should look into.
Native .NET Core solution through IHostedService
Hangfire
Personally, I like that you can configure a dashboard and see what happened during the execution of your scheduled tasks.
As suggested by #Lei Yang in the comments, Quartz.NET
Hangfire is still adding in-memory support. Therefore, you're required to have a SQL Server to store all the information about the job (triggers, states, etc.).
This can have a huge impact in your decision. On the other hand, Quartz.NET does support in-memory store type.
This is ASP.NET ASMX Web Service / .NET Framework 4.0.
In web service, I want to execute one method on another thread something like “Fire and Forget” so that Web Service returns some value in response immediately to web site. That method on another thread could take 10 minutes after Web Service returns response immediately to Web site. Also, I do not need return value of that method.
I have tested this scenario using ThreadPool.QueueUserWorkItem and it seems that thread started using ThreadPool will still keep executing even after Web Service returns response back to Web site. Am I correct here? Also is there a better way to achieve this?
The problem is that every now and then, ASP.NET will recycle the app pool. Because it doesn't know about your background task, it will not be considered and will be aborted when the AppDomain is disposed.
Most of the time, the work will complete, but if you run for long enough, you will encounter this scenario.
There are two solutions:
1) The "proper" way is to write a Windows Service that runs outside ASP.NET. You can send instructions to the Service over WCF.
2) The "quick and dirty" way is to write a hidden web service in your ASP.NET site that is never called by users. Your app starts an asynchronous request to the hidden service and then returns its own result to the user, without waiting.
ASP.NET does not know that the request to the hidden service came from inside your app - it just treats it as another request. Because ASP.NET knows about this request, it will not abort it when it recycles.
I have an ASP.NET Webform which currently calls a Java WebService. The ASP.NET Webform is created/maintained inhouse, whereas the Java WS is a package solution where we only have a WS interface to the application.
The problem is, that the Java WS is sometimes slow to respond due to system load etc. and there is nothing I can do about this. So currently at the moment there is a long delay on the ASP.NET Webform sometimes if the Java-WS is slow to respond, sometimes causing ASP.NET to reach its timeout value and throw the connection.
I need to ensure data connectivity between these two applications, which I can do by increasing the timeout value, but I cannot have the ASP.NET form wait longer than a couple of seconds.
This is where the idea of a queuing system comes into place.
My idea is, to have the ASP.NET form build the soap request and then queue it in a local queue, where then a Daemon runs and fires off the requests at the Java-WS.
Before I start building something from scratch I need a couple of pointers.
Is my solution viable ?
Are there any libraries etc already out there that I can achieve this functionality with ?
Is there a better way of achieving what i am looking for ?
You can create a WindowsService hosting a WCF service.
Your web app can them call the WCF methods of your Windows Service.
Your windows service can call the java web service methods asynchronously, using the
begin/End pattern
Your windows service can even store the answers of the java web service, and expose them through another WCF methods. For example you could have this methods in your WCF service:
1) a method that allows to call inderectly a java web service and returnd an identifier for this call
2) another method that returns the java web service call result by presenting the identifier of the call
You can even use AJAX to call the WCF methods of your Windows Service.
You have two separate problems:
Your web form needs to learn to send a request to a service and later poll to get the results of that service. You can do this by writing a simple intermediate service (in WCF, please) which would have two operations: one to call the Java service asynchronously, and the other to find out whether the async call has completed, and return the results if it has.
You may need to persistently queue up requests to the Java service. The easiest way to do this, if performance isn't a top concern (and it seems not to be), is to break the intermediate service in #1 into two: one half calls the other half using a WCF MSMQ binding. This will transparently use MSMQ as a transport, causing queued requests to stay in the queue until they are pulled out by the second half. The second half would be written as a Windows service so that it comes up on system boot and starts emptying the queue.
you could use MSMQ for queuing up the requests from you client.
Bear in mind that MSMQ doesn't handle anything for you - it's just a transport.
All it does is take MSMQ messages and deliver them to MSMQ queues.
The creation of the original messages and the processing of the delivered messages is all handled in your own code on the sending and receiving machines: the destination machine would have to have MSMQ installed plus a custom service running to pick them up and process them
Anyway there is a librays for interop with MSQM using JAVA : http://msmqjava.codeplex.com/
Another way could be you can create a queue on one of your windows box and then create a service that pick up the messages form the Queue and foreward them to the Java service
I want to run an event periodically on the server side that is to be initiated by the server in ASP.NET scenario. There will be no request from client.
Your help will be much appreciated.
Assuming you have access to the server and can install external applications, you could create a stand-alone Windows Service or even a console application that is triggered by the built in Windows Task Scheduler.
For something that runs in Asp.Net you could use Quartz.net. This SO question explains how to use it with Asp.Net
You need to spawn a process using the Process class. The process will sleep until the recurrence time comes.
Process p = new Process();
p.StartInfo.FileName = "foo";
p.Start();
Another alternative is to spool a thread using the Thread class.
For a similar situation in some of the applications, I use a separate service (windows service/web service) and use System.Threading.Timer (see http://msdn.microsoft.com/en-us/library/system.threading.timer.aspx) and implement a scheduler of my own. Or otherwise, you can use any server based standard scheduler to invoke some executable that in turn hits your service.
I would just create a standard command line executable and have it run with the Windows Scheduling Tool.
A windows service is fine if it runs in very short intervals, but for example for once a day task, I think its the wrong approach.
Have a look at the Windows Workflow Foundation
That framework is built for this kind of things, like state persistance etc. It also runs separate, so the process will not go down when your app(pool) goes down (by default due to IIS).
Integrates fully with asp.net and you'll probably end up (in a positive way) with a Delay Activity.
We have an application that hits a web service successfully, and the data returned updates our DB. What I'm trying to do is allow the user to continue using other parts of our web app while the web service processes their request and returns the necessary data.
Is this asynchronous processing? I've seen some console app samples on the msdn site, but considering this is a web form using a browser I'm not sure those samples apply. What if the user closes the browser window mid request? Currently we're using the Message Queue which "waits" for the web service to respond then handles the DB update, but we'd really like to get rid of that.
I'm (obviously) new to async requests and could use some help figuring this out. Does anyone have some code samples or pertinent articles I could check out?
Yes, what you're describing is async processing.
The best solution depends to some degree on the nature of the web services call and how you want to handle the results. A few tips that might help:
One approach is to send a request from the initial web request to a background thread. This works best if your users don't need to see the results of the call as soon as it completes.
Another approach is to have your server-side code make an async web services call. This is the way to go if your users do need to see the results. The advantage of an async call on the server side is that it doesn't tie up an ASP.NET worker thread waiting for results (which can seriously impair scalability)
Your server-side code can be structured either as a web page (*.aspx) or a WCF service, depending on what you want to have it return. Both forms support async.
From the client, you can use an async XMLHTTP request (Ajax). That way, you will receive a notification event when the call completes.
Another approach for long-running tasks is to write them to a persistent queue using Service Broker. This works best for things that you'd like users to be able to start and then walk away from and see the results later, with an assurance that the task will be completed.
In case it helps, I cover each of these techniques in detail in my book, along with code examples: Ultra-Fast ASP.NET.
If you're not blocking for a method return you're doing asychronous processing. Have a look at Dino Esposito's article on using AJAX for server task checking.
You can perform asynchronous web service calls using both Web Service Enhancements (WSE) and Windows Communication Foundation (WCF) in your C# code. WSE is discontinued, so its use is not recommended. Generically speaking, if you were to terminate program execution in the middle of an asynchronous call before the response returned, nothing bad would happen; the client would simply not process the result, but the web service would still be able to perform its processing to completion.
If your client web application is responsible for updating the DB, then without anything else in your client code, quitting in the middle of an asynchronous operation would mean that the DB was not updated. However, you could add some code to your client application that prevented the browser from quitting entirely while it is waiting for an asynchronous response while preventing new web service calls from being run after Close is called (using Javascript).
You have 2 distinct communications here: (1) from web browser to web application and (2) from web application to web service.
diagram http://img697.imageshack.us/img697/6713/diagramo.png
There is no point of making (2) asynchronous: you still would have to wait for web service to finish processing request. If you end HTTP request from browser to web application the client would have no clue what the result of request was.
It is much better to make asynchronous request from web browser to your web application. Ajax is ideal for that. In fact, that's what it was created for. Here's couple of links to get you started:
jQuery Ajax
ASP.NET AJAX