The default setting for thr file upload control is 4MB we can overwrite in web.config.
If you are using IIS7 use both else maxRequestLength is enough.
In system.web
<httpRuntime maxRequestLength="1048576" executionTimeout="3600" />
And in system.webServer
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="1073741824" />
</requestFiltering>
</security>
IMPORTANT: Both of these values must match. In this case, my max upload is 1024 megabytes.
maxRequestLength has 1048576 KILOBYTES, and maxAllowedContentLength has 1073741824 BYTES.
I know it's obvious, but it's easy to overlook.
