There is a default maxRequestLength set at 4MB in ASP.NET, you can change it in the web.config.
<configuration>
<system.web>
<!-- This will handle requests up to 1024MB (1GB) -->
<httpRuntime maxRequestLength="1048576" timeout="3600" />
</system.web>
</configuration>
The length is specified in KB in the config file. If you are using IIS there is an additional limit set at 4MB by IIS.
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