How to download a file form server which path is stored in database

Hi,i am Asp.net c# developer doing final project ..i m working on uploading and downloading files to and from server  while path is saved in database and file is saved in server folder. i have done uploading work by creating a table in database in which i create column ID ,File Path, Patient ID (reference as foreign key) and code for uploading and its working well as it saves file in folder and saving path in file path column...Now i want code for download i want that when user click download button it will download file with reference to patient ID system pick File path and download file to client PC...Please suggest me code for it .I searched much but its not found what i required ...Thanks in advance