System.Security.Policy.PolicyException: Required permissions cannot be acquired.

Question

hello,

           when i used report viewer following dll  is missing then i put in the bin folder
         Microsoft.ReportViewer.Common.dll
         Microsoft.ReportViewer.WebForms.dll.

        it show  another error is System.Security.Policy.PolicyException: Required permissions cannot be acquired.

FileLoadException: Could not load file or assembly 'Microsoft.ReportViewer.Common, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Failed to grant minimum permission requests

  

System.Security.Policy.PolicyException: Required permissions cannot be acquired.

Answer 1

Hi, Merlin:
    The exception indicates that the permission required by the assembly for its minimum grant set is not granted by the CLR security policy. So the assembly couldn't be loaded and the exception is thrown. You could check its minimum request set by looking for .permissionset reqmin in ILDasmto see why your policy didn't grant the assembly those permissions. 
    Here are some refs you may need:
    1. Understanding Security Policies
        http://msdn.microsoft.com/en-us/library/ms154466.aspx
    2. The Security Infrastructure of the CLR Provides Evidence, Policy, Permissions, and Enforcement Services
        http://msdn.microsoft.com/en-us/magazine/cc188939.aspx

---

Please mark the right answer at right time.
Thanks,
Sam