Uploading audio file based on the user specified ID.

I want to upload audio file based on the ID which i choose

For ex: I have three ID's in drop downlist, say

ID #1: 1001

ID #2: 1002

ID #3: 1003

I want to upload audio file for 1001. Later, On the same id i may upload another file also. 

Then, If i choose 1001, the list of files that has been uploaded on 1001 sholud be displayed with download option in Gridview.

For SQL SERVER 2008. 

Kindly help me. Thanks in advance.