download pdf or mp4 video file from link and save in local

Question

download pdf or mp4 video files from link and save in local file folder using asp net with c#

Example i have pdf like --
http://www.abc.com/getpat/abc.pdf
http://www.abc.com/getpat/abc.mp4

the abowe files are uploaded in my website.
that files i need to download client system.

this two files i need to store local system through c# code in asp.net.