How to increase the max upload file size in ASP.NET?

Problem

In ASP.NET, I have a form that accepts a file upload. I need to increase the maximum upload size beyond the default of 4 MB.

I’ve seen references to the code below on msdn in a few places.

[ConfigurationPropertyAttribute("maxRequestLength", DefaultValue = )]

None of the references explain how to use it, and I’ve tried a few different approaches with no luck. This attribute should only be changed for pages that request a file upload.

Is this the best course of action? And what am I going to do with it?

Asked by Eddie

Solution #1

This option is found in the web.config file. However, it has an impact on the overall application… I don’t believe it’s possible to set it per page.

<configuration>
  <system.web>
    <httpRuntime maxRequestLength="xxx" />
  </system.web>
</configuration>

“xxx” is a KB value. 4096 (= 4 MB) is the default value.

Answered by Eric Rosenberger

Solution #2

You must also add the following to IIS 7+ in addition to the httpRuntime maxRequestLength setting:

  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="52428800" /> <!--50MB-->
      </requestFiltering>
    </security>
  </system.webServer>

Alternatively, in IIS (7):

Answered by 4imble

Solution #3

There are two ways to increase the upload file size limit.

1. IIS6 or a lesser version

Set maxRequestLength to “15360” if you want to limit uploads to 15MB (15 x 1024).

<system.web>
   <!-- maxRequestLength for asp.net, in KB --> 
   <httpRuntime maxRequestLength="15360" ></httpRuntime> 
</system.web>

2. IIS7 or higher is required.

Set maxRequestLength to “15360” and maxAllowedContentLength to “15728640” if you want to limit uploads to 15MB (15 x 1024 x 1024).

<system.web>
   <!-- maxRequestLength for asp.net, in KB --> 
   <httpRuntime maxRequestLength="15360" ></httpRuntime> 
</system.web>

<system.webServer>              
   <security> 
      <requestFiltering> 
         <!-- maxAllowedContentLength, for IIS, in bytes --> 
         <requestLimits maxAllowedContentLength="15728640" ></requestLimits>
      </requestFiltering> 
   </security>
</system.webServer>

https://msdn.microsoft.com/en-us/library/e1f13641(VS.80).aspx MSDN Reference

Answered by Malik Khalil

Solution #4

This line in Web.config, I assume, will set the maximum upload size:

<system.web>

        <httpRuntime maxRequestLength="600000"/>
</system.web>

Answered by ben

Solution #5

For a 2 GB maximum restriction, set the following in your application’s web.config:

<system.web>
  <compilation debug="true" targetFramework="4.5" />
  <httpRuntime targetFramework="4.5" maxRequestLength="2147483647" executionTimeout="1600" requestLengthDiskThreshold="2147483647" />
</system.web>

<system.webServer>
  <security>
    <requestFiltering>
      <requestLimits maxAllowedContentLength="2147483647" />
    </requestFiltering>
  </security>
</system.webServer>

Answered by cangosta

Post is based on https://stackoverflow.com/questions/288612/how-to-increase-the-max-upload-file-size-in-asp-net