Quote: ".. you must first create the assembly, make it available to Report Designer, add a reference to the assembly in the report, and then use an expression in the report ... When the report is deployed to the report server, you must also deploy the custom assembly to the report server." End of quote.
Why did you fail or neglect to mention, that custom assembly must be added to the report server bin (%ProgramFiles%\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services\ReportServer\bin
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