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Asked: 2026-05-14T01:31:27+00:00

I am designing a report that will be used in local mode (an RDLC

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I am designing a report that will be used in local mode (an RDLC file) in a Winform app. I have a custom assembly with a static class that has some functions that I want to use inside of the report (as expressions).

I have found all sorts of help for doing this with RDL reports, but I’m running into a permissions problem with my RDLC report.

I get the following error at runtime:
“The report references the code module (my module), which is not a trusted assembly”.

I know that this is some kind of a code security issue, but I’m not sure what to do to fix it. The documentation that I have seen online is aimed at RDL reports, and it instructs me to edit a SQL Server-specific policy file. I’m using RDLC, so there is no sql server involved. What do I need to do to acquire the appropriate permissions?

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1 Answer

  1. Editorial Team

    Try using the AddTrustedCodeModuleInCurrentAppDomain method of the
    ReportViewer.LocalReport Property (reportViewer.LocalReport.AddTrustedCodeModuleInCurrentAppDomain(“your assembly”)).

    Also make sure you use the AllowPartiallyTrustedCallers attribute with your assembly ([assembly:AllowPartiallyTrustedCallers]).

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