Downloadfile in asp net

This feature is well known and very used for any kind of business requirements, like download or upload physical files, ensuring proper network trap, storing in server location sometime encrypted, ASP. Some common syntax normally used to introduce the same:. Download file is one the key feature for any of the web applications in spite of any programming language we used.

Normally developer decided to provide critical features of uploading and downloading documents from the web applications. Documents can be any type; it depends on business logic. As per the client requirements, all kinds of documents can be uploaded or downloaded from the screen. It also makes sure to downloaded files that should be secure and does not tamper.

For security purpose, some of the application maintain file signature, which normally ensuring the content of the file should not tamper and always be same whatever uploaded. This kind of feature is very much urgent in case validation of documents where those are very urgent and using for some extra facility. Also, this downloading done some network tap. So that document can tamper in-network travel as well, so some applications encrypted the file with some secure code, and then at the time of reading decrypt the same from the application and read it for further work.

This one can give full security from hackers as well. If any file downloaded an entirely encrypted approach and maintained proper signature to ensure file content exactly the same whatever uploaded, then that application can be considered as a fully secure application, hackers have very little chance to tamper anything on that specific application.

As an example, we can create one specific ASP. Net Framework 3. Clear ; Res. AddHeader "Content-Length", file1. Flush ; Res. TransmitFile file1. FullName ; Res. Here is perhaps the simplest, shortest way to download a file in an ASP.

Net application: Response. TransmitFile Server. End ; The first step is to set the content type. In the example above, we're downloading a. Here are some of the most common content types:. TransmitFile retrieves a file and writes it to the Response. In some cases, we can't call TransmitFile because we can't map a path to the file.

Instead, we'll get the file as a Stream and write it to the Response object: Response. Open, FileAccess. Read buffer, 0, bufferLength ; Response. Flush ; Response. The project download includes working examples of both of these techniques. View All.