Accessing a network file with FileInfo

My Web Applicaiton is running in Windows Authentication mode. My Web Server is running in domain LDSelfCare.

There is a file server in domain LDCustomerCare and I want to read a file from my web application like \\machineinldcustomercaredomain\sharename\hello.txt

I am able to open the file in Notepad but through FileInfo in C#/ASP.NET, getting an access denied. What is the issue?