I have Downloaded the Similar Project u can use source code for Reference from here
http://www.c-sharpcorner.com/UploadFile/rahul4_saxena/1130/[
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This is a small office management system. With the help of this project all office employee can connect with each other, request online leave, get birthday reminders, get status of present/absent employees and use an automatic attendence system when logged in and logged out. Just need to install and setup of this project to every machine.
In this project there are 2 types of users one is Employee of a office and other is Admin. An Admin has full access for this project. I am showing every right of both types of user in the following DFD.