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Windows service (Client) is communicating with C# Web API (Server). I want to check the server is online or not at a time interval

If the C# server is offline then Windows Service will storage the data in SQLite and when the server is back online it will process the data. I can use a trimmer to check the server is online in every 5-10 sec. I wonder is there any better approach to deal with this kind of scenario?

The right solution for scheduling simple processes is the Windows Task Scheduler.
If you're writing a Windows Service that runs a timer, you should re-evaluate your solution. ..
–Jon Galloway, ASP.NET MVC community program manager, author, part time superhero
//TODONT: Use a Windows Service just to run a scheduled process

Adding and removing jobs dynamically to Quartz.NET Windows Service

I am developing an email marketing WinForm application. And for the scheduling of campaigns, I decided to use Quartz.NET. I need it to be running as a Windows Service. but I also want the user to be able to add a job (e.g. a campaign that needs to be run everyday at 8 AM which is basically running a .bat file) to the service through the program.
I am also saving all the job schedules in the database so that when you stop/start the OS or Windows Service it can still read from all the jobs that need to be run.
How can I add a job to the service while the service is running? The dynamic addition/removal of the job to the service is of course much preferred. Stopping the service and reading all the jobs again from the database is, to be frank, my last resort.

You can install Quartz.Net as a windows service and configure it to use AdoJobStore.
Your WinForm application will be the interface where you can add, suspend and remove jobs and triggers.
You do not have to stop your windows services while you're doing that.
You do not need to read your database to figure out what's happening in Quartz but you must use the APIs provided.
I've done something similar long time ago; my quartz.net "manager" was a web application.
You can read my answer here.
I guess the steps to do what you're looking for a pretty much the same.
Reference to Quartz.net samples and a free book can be found here and here.

Run ASP.net c# Web Application Automatically

I have a ASP.net web application that checks the status of my servers, it then wraps all this information up and puts it in a email. My Question how do I run this automatically say every day at like 2:00am, or like every 12 Hours?
Thanks

The best solution is to create a simple MS Windows Service which will do this job.

You'd better implement this as a separate process from your ASP.NET application. Phil Haack has summarized the reasons in this blog post. A Windows service for example or even a console application using the windows scheduler could work just fine for this task.

You want a scheduler - I recommend Quartz.NET.
As others have said, your code doesn't have to be in a web app.
If it is, then schedule a job that uses WebClient to make a request to your web app.

Check out WebDriver.
It's intended as a test / qa framework, but there's nothing stopping you from using it in a console application, which you can then run as a Scheduled Task. Note that whatever machine runs the Scheduled Task has to have a browser that WebDriver can fire up.

The easiest solution would be to create a scheduled task on your server using the Windows Task Scheduler and setup this job so that it uses internet explorer to visit your webpage.
If you open the task scheduler and create a new task. In the "Run" field put:
"C:\Program Files\Internet Explorer\IEXPLORE.EXE""http://www.yoursite.com/yourpage.aspx"
Then in the "Start in" field put:
"C:\Program Files\Internet Explorer"
Now configure this task to run at 2:00am every day.

Interactive "screen" for WCF hosted in service

I have a WCF Service that I already mention in another question here. As I have read here host WCF in Windows service is the best solution for all reasons. So that's why I select this option. But windows service hosting doesn't allow any visual process communication (before we used self-hosted service, that have hosted in console application and report any problems just into console). How can I get similar way for hosting service? My thoughts is about using another named pipes binding for visual "communication" between service and human.
I would be very nice for me if somebody recommend me something useful.
Thanks very much in advance guys!

In case you need the "Screen" just so that the service can report the problems, the I would suggest that you use windows event to log such events from the service and then you can create any UI/back ground process that can look for such events in window event log and report them appropriately (ex: sending email etc)

I tend to agree with #Ankur's answer, but figured I'd give you an alternative option. You could consider using WMI provide visual feedback to a running service. I attended an interesting ALT.NET talk on the subject (not WCF specific) a while back (full video is available here) and it should be relatively straightforward to instrument your application with WMI to allow you system state to be queried

Building and controlling a scheduled task or service from a web application

I'm building a web application that will need to import data from other database servers when it starts.
I would like to have this import done automatically at regular intervals. I would also like to be able to start and stop the import process from my web application.
What would be the best implementation for the import agent - a Windows Service? Something else?

If your web application needs to have this data in memory, you can use the Cache class.
Set it to expire every X hours, as you need and when it expires, re-fetch the data..

You could create a Windows Service that uses Quartz.Net to run the scheduled tasks.
You should not run scheduled task from your web app, since you don't have any guarantee that your web app is running. You're at IIS app pool management's mercy.
You might want to look at Best way to run scheduled tasks.

Of what I heard this looks like a description for Microsoft Sync Framework. I have just few information about it for myself but will be pleased to see you pointed into that direction.
I'm not sure about your question because you are talking about hourly syncing. When talking web applications, there can't be a nice way to do such a task. You have to create a console app or best task would be a Windows Service Process (which are easier then it sounds)?
Sync Framework Intro
http://msdn.microsoft.com/en-us/sync/bb821992
Sync Framework Tutorial
http://alexduggleby.com/2007/12/16/sync-framework-tutorial-part-1-introduction/
Sync Framework Samples
http://archive.msdn.microsoft.com/sync
And, when I'm editing the answer with links
Nice guide to create a Windows Service (and setup)
http://www.codeproject.com/KB/dotnet/simplewindowsservice.aspx
(if first time, try it on a test project before the production project)

This might be an oversimplification, but can you create a class that does all of this work using a Timer, and then in the application_start of the global.asax, create a BackgroundWorker that kicks off this process?
Your web application could then control the BackgroundWorker object, starting/stopping as necessary.