Restricting upload file types

Restricting upload file types

In this tutorial we will explain how to only allow specific files to be uploaded. You can restrict unwanted file types from being uploaded (depending on their extension).

How to do it

To make the file upload with restricted file types, you need to:

1.  Start with basic upload page

   Start with an upload page where you have Pure ASP.NET Upload on it. If you haven't done it yet, go through the Simple file upload tutorial.

2.  Open the Pure ASP.NET Upload dialog

   Select the Pure ASP.NET Upload dialog by opening the Server Behaviors Panel. Select DMXzone - Pure ASP.NET Upload.



3.  Select the Allowed Extensions

When you need to restrict the uploaded files to specific number of extensions, you need to select the Allowed Extensions field.

First choose the extensions type. All means no restriction, Images Only will fill in the most common image extensions and Custom will allow you to enter your own comma separated list of allowed extensions.

In this example we've chosen to only allow our users to upload Images Only.



So now you choose for example to upload Images Only.

4.  Save and done

Save your page and upload it to your server, and you are done! Go to your website and test it - you should only be able to upload images now.