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Exception: That assembly does not allow partially trusted callers

I have .net 3.5 program where i load some assemblies from a network share via reflection. Now i've got the following exception: "That assembly does not allow partially trusted callers''(Detailed message below). The calling assembly(.exe) is local. This .exe loads the assembly from network via reflection. The assembly from the network share then has a reference on a third assembly which is located beneath the .exe. (Hard to explain, image will do better...)

The reason for this failure is the .net security. It doesn't allow the MyLib.dll to be loaded, because the calling assembly is located on a network share and is signed with a strong name.

Solution 1, caspol.exe Allow all code to be executed. This might be dangerous, but if you're desperate it could be a solution.

 "C:\Windows\Microsoft.NET\Framework\v2.0.50727\CasPol.exe" -machine -chggroup All_Code FullTrust

Solution 2, no signing If you remove the signature from MyLib2.dll, everything works.

Solution 3, set attribute AllowPartiallyTrustedCallers If you set the AllowPartiallyTrustedCallers in the AssemblyInfo.cs of the signed assembly, everything works.

using System.Security;

[assembly: AllowPartiallyTrustedCallers()]

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Full exception(for google):

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.FileNotFoundException: Could not load file or assembly 'PermissionCaspolTestLibSigned, Version=, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'PermissionCaspolTestLibSigned, Version=, Culture=neutral, PublicKeyToken=null'
   at PermissionCasplTestLib.Class1..ctor()

WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

--- End of inner exception stack trace --- at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at PermissionCaspolTest.Program.DoSth() ----- Inner Exception ----- System.IO.FileNotFoundException: Could not load file or assembly 'PermissionCaspolTestLibSigned, Version=, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified. File name: 'PermissionCaspolTestLibSigned, Version=, Culture=neutral, PublicKeyToken=null' at PermissionCasplTestLib.Class1..ctor()

WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].


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Either that or ask your bank to give you a temporary account number that the money could be sent to on a one time basis. Most bankers will accommodate you if there's an issue with wire transfer security.

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