Tips on maximizing the file size limit of the fileupload control in asp.net

I am trying to determine the file size limit for my file upload control.

Below is the HTML code snippet:

<input id="uplTheFile" style="WIDTH: 318px; HEIGHT: 22px" type="file" size="80" name="uplTheFile" runat="server">

I have checked the code but could not find any information. The attribute size = 80 seems unclear to me. I also searched online, but all I found was that it is an optional attribute. I am unsure if it defines the file size limit.

Can anyone provide some insight?

Answer №1

To restrict the size of uploaded files, you must configure the HttpRuntimeSection.MaxRequestLength property.

The default maximum request size is 4096 KB (4 MB).

You can adjust the maxRequestLength in the web.config file. For instance, the following snippet sets a limit of 20MB in web.config.

<system.web>
     <!-- ....   -->
     <httpRuntime maxRequestLength="20480"/>
     <!-- ....   -->  
</system.web>

By specifying the input stream buffering threshold limit in KB, you can prevent denial of service attacks resulting from users uploading large files to the server. More information on HttpRuntime can be found in this MSDN article.

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