If you’re using a third-party control, such as Telerik’s Asynchronous ASP.NET upload control, all of the above modifications will be taken care of for you. There’s an easier way to upload and validate files It does support file type and size validation on the client.īrowser support: Firefox < 3.6, IE9,8,7.
It then starts uploading the chunks one after another subsequently. In contrast, the Silverlight upload is designed in a different way so that it divides the file to be uploaded on the client side in many chunks, each of which is 2MB large. Since both modules upload a file with a single request, in case of uploading a file larger than the 4MB ASP.NET default limitation, you need to modify your web.config file as shown in the first section.īrowser support: IE9,8,7. The files are uploaded using Post HTTP request in absolutely the same manner as the normal. It is very important to know that the Flash module allows you to validate both file type and size on the client side. The IFrame uses tag for file uploads, whereas Flash uses the Flex object in order to upload files. The IFrame and Flash modules upload the selected file(s) using normal http post request. Let’s explain a bit about each of the modules: Flash & IFrame Modules
They are available for download and install though your browser Add-on manager. You can simply use the Adobe Flash or Silverlight plugin. Of course there are some additional options to choose from if your browser does not support the HTML5 File API and you want to avoid writing a custom JavaScript code. Other options: using Silverlight, Flash or IFrame plugins By default it restricts the content length to 30,000,000 bytes.įor example, the web.config configuration allowing uploads of files up to 100MB and upload periods of up to 1 hour should look like the following: maxAllowedContentLength (IIS 7) - specifies the maximum length of content in a request supported by IIS.If the request takes longer to be executed, an exception will be thrown.
In this blog post I am going to show you how to overcome this limitation, as well as how to validate the file size and type on the client before submitting it to the server.
I bet that most of you have faced this common problem: “How to upload large size files (above 4MB) in ASP.NET?” As you know, the default maximum file size allowed in the framework is 4MB and this is to prevent service attacks like submitting large files, which can overwhelm the server resources.