Paypal Payment Pro not working in asp.net
<p>I am new to paypal integration.I have just integrate Paypal's direct payment in a asp.net web application using the code provide by paypal.When i click payment button a security exception is generated:</p>

<pre><code>Description: The application attempted to perform an operation not allowed by the security policy.  To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file. 

Exception Details: System.Security.SecurityException: That assembly does not allow partially trusted callers.
Source Error: 
Line 121:            Response.Redirect("Paymentform.aspx?fail=1");
Line 122:        }
Line 123:    }
Line 124:
Line 125:    protected void Populate1()
</code></pre>

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<p>The site is hosted by godaddy.
    Can anyone tell me what is the solution.Thanks in advance.</p>
