Automatically save data to database periodically at regular Intervals using Windows Service in C# and VB.Net

i want to save some data on database without performing any action. coding is created in asp.net using c#,it will take feeds from a website and directoly save it in database. what i need to do for that.Note i dont want to open the page and click on some button and after that it takes the feeds.

how can i use webservice ? please help me