How to Increase the Maximum File Upload Size in ASP.NET?

Boosting ASP.NET's File Upload Limits

ASP.NET applications often encounter limitations on maximum file upload sizes, typically capped at 4 MB. This guide outlines how to overcome this restriction.

The web.config Solution

Contrary to some suggestions, altering the maxRequestLength attribute isn't done via code attributes. The effective method involves modifying your application's web.config file (located in the root directory).

Adjusting the web.config File

Within the <system.web> section of your web.config, add or modify the following:

<code class="language-xml"><configuration>
  <system.web>
    <httpRuntime maxRequestLength="xxx" />
  </system.web>
</configuration></code>

Defining the Maximum Upload Size

Replace "xxx" with your desired maximum upload size in kilobytes (KB). Remember that 4096 KB equals 4 MB. To set a 10 MB limit, use:

<code class="language-xml"><httpRuntime maxRequestLength="10240" /></code>

This adjustment applies the new maximum upload size to your entire application. While individual page-level control isn't offered, this approach effectively increases your ASP.NET application's file upload capacity.

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