This setting goes in your web.config file. It affects the entire application, though... I don't think you can set it per page.
<configuration>
<system.web>
<httpRuntime maxRequestLength="xxx" />
</system.web>
</configuration>
"xxx" is in KB, the default is 4096 (= 4 MB).
I tried it for 10240(10 MB) and it works for me.
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Thanks
Murugan