Sql2005 - Create Assembly

Does anyone know good articles for integrating .NET assemblies into SQL Server?

I'm trying to create an assembly at the moment and I'm getting this error:

Code:

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Msg 6213, Level 16, State 1, Line 1
CREATE ASSEMBLY failed because method "set_mobjClient" on type "fgoTest.Test" in safe assembly "TestAssembly" has a synchronized attribute. Explicit synchronization is not allowed in safe assemblies.

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I really have no idea what it means and can't find any help on it.

What is the code you are using?

Do you mean in my assembly or in t-SQL?

You'll have to set the database to allow EXTERNAL or UNSAFE asseblies. Take a look at those keywords in BOL.