Problem uploading large files in ASP.NET

If you try to upload large files you might get an exception like

HttpException: Maximum request lenght exceeded.

This problem occurs because the default value for the maxRequestLength parameter in the section 

of the machine.config or Web.config file is 4096 (4M).

So any file with a size bigger will fail.

However I think that the max size that you can write here is 2G 2097151

Some info can be found here: http://support.microsoft.com/default.aspx?scid=kb;EN-US;295626

So to change that for 512mb use something like:

<configuration>

    <system.web>

        <httpRuntime maxRequestLength="524288" /> 

    </system.web>

</configuration>