Research of Uploading and Downloading Module of Files Based on ASP.NET

File uploading and downloading is commonly functions in Web procedures,and is widely used.This paper analyzes several kinds of means of file uploading and downloading in ASP.NET,and due to the limit of the ASP.NET built-in upload components to com plete large file uploading,elaborated with emphasis on the large file uploading and downloading technology,and gives the solutions,to en sure that it is in the normal application in film video sites.