windows service for an application

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C#

Hi ! I am doing inventory control Application for my company,which can add,update,delete,print on products.Now i want to create a windows service which runs to generate a product report from my application and it should attach those reports and send email to the addresses which i stored thro my application.In my application i am using windows report,this service should use that report and export it to excel file before sending.This email sending should be done on every Saturday(say).
Help me to work with windows service....
all your advices are appreciable !