Scan Image In Asp.net

Question

Hi,

 

I am working on an application in which, the user has to first Scan and upload Mulitple Documents based on document type like ID,Passport etc..

When the user Scans/uploads the document then first it should store in Some temp Folder. Only when the user  click save button , the system will generate the Unique document no and All the Scanned document will be uploaded to Actual Folder with unique  DocNO_filename format.

 

which is the best way to do it (i.e, scan app using asp.net and store it to temporary folder in the application) ?