How to create a service like web api which contineously runs

A cron job is not something that runs continuously. Cron is a scheduler, like the Windows Task Scheduler, that runs jobs as specified. I assume that Cron is a service that runs continuously but the jobs that it shedules are not normally (probably never) run continuously. In both Unix/Linux and in Windows services are what run continuously.

If you want someting like cron in Linux but for Windows then you can use the Windows Task Scheduler.

You can use a library like Hangfire. Hangfire allows you to schedule background jobs in .NET applications.

Are you trying to create a service like the ones shown in the Services tab of the Task Manager?

Create A Windows Service In C#
https://www.c-sharpcorner.com/article/create-windows-services-in-c-sharp

Create Windows Service using BackgroundService - .NET | Microsoft Learnhttps://learn.microsoft.com/en-us/dotnet/core/extensions/windows-service?pivots=dotnet-7-0

You can use Hangfire or Quartz for the same.

I did not encountered with any problem I would like to know how I could achieve that type of cron job like it continuesly runs and push and pop record like do I need to create a web service or windows service etc.

Hey Mark Tabor,
        Could you clarify at which point you encountered the problem?