Haw to create WCF Service With Security in C#

Question

Hi Everyone  i have created a project using linqtosql  in DNN now i want to create  a WCF Service want to use this service in my project. Means all the store procedure table etc are in this WCF service. call this service into our project and perform all operation like insert,update delete etc.
Problem is that i want a secure WCF Service so no one can access this service i dont know haw to do this last one month i  searching but not getting any solutions.
I dont know anything about security and haw it work. purpose is that i want to use this service to multiple project.

Please send me a sample project so that i can use this.

any response from ur side awaited form me.

Thanks

Shamsher Ali
Email id:[email protected]