C# .NET - Accessing server using a service account

I have a web server and i need to access  certain folder in that server for which i have been given all the privileges using a  service account (username,password,domain) i have to access the folder. could any one let me know the code in c# or any link for that

You need to implement impersonation for it.
Explore Impersonation and understand how to implement the same.