System.Security.SecurityException: That assembly does not allow partially trusted callers

I got Security Exception error: “System.Security.SecurityException: That assembly does not allow partially trusted callers.” when implement Implement Google Captcha with C#.

System.Security.SecurityException That assembly does not allow partially trusted callers.

Fix the Security Exception issue

In order to resolve the issue “System.Security.SecurityException: That assembly does not allow partially trusted callers.”, simply add <trust level="Full" /> in the web.config file in system.web section as below:

web.config:

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<?xml version="1.0"?>
 
<configuration>
 
	<system.web>
		<compilation debug="true" targetFramework="4.0" />
		<customErrors mode="Off"/>
 
		<trust level="Full" />	</system.web>
 
	<appSettings>
	</appSettings>
 
</configuration>