How can i call a windows service from my Web App ?

Hi ,

I have a web page which dispaly user input fields . "firstname" , "lastname" etc

How can i get a windows service to get the data in the input fields and write the data to a database ?

I have a solution with a web app that gets the data and on a button click it inserts into a database , But i want it so that the button is clicked then the windows service will insert the data.

Thanks