Using strong-named custom assemblies
A strong name identifies an assembly and includes the assembly's text name, four-part version number, culture information (if provided), a public key, and a digital signature stored in the assembly's manifest. A strong name uniquely identifies an assembly to the common language runtime (CLR) and ensures binary integrity.
Use AllowPartiallyTrustedCallersAttribute
To use strong-named assemblies with reports, you must allow your strong-named assembly to be called by partially trusted code using the assembly's AllowPartiallyTrustedCallers attribute. You can use AllowPartiallyTrustedCallersAttribute to allow strong-named assemblies to be called by Report Designer or the report server in report expressions. To allow partially trusted code to call strong-named assemblies, add the following assembly-level attribute to your assembly attribute file.
<assembly:AllowPartiallyTrustedCallers>
[assembly:AllowPartiallyTrustedCallers]
AllowPartiallyTrustedCallersAttribute is effective only when applied by a strong-named assembly at the assembly level. For more information about applying attributes at the assembly level, see "Applying Attributes" in the Microsoft .NET Framework SDK documentation.
Caution
When AllowPartiallyTrustedCallersAttribute is present, the default FullTrustLinkDemand security checks are prevented, making the assembly callable from any other partially trusted assembly. All security checks, including class-level or method-level declarative security attributes, must be explicitly stated.