Failed to CREATE AN ASSEMBLY in SQL

Question

I've already dived into SQL clr programming. Unfortunately my first attempt is troubled. My C# assembly code is just so:

enter code here
public partial class FirstCLRRoutines
{
    public static int GetCLRFrameworkMajorVersion()
    {
        return System.Environment.Version.Major;
    }
}

And SQL code is:

USE master
GO
CREATE ASSEMBLY [Chapter2.FirstCLRRoutine]
FROM 'D:\projeler\SQL_CLR\SQL_CLR\bin\Debug\SQL_CLR.dll'

But I get this error message from MSSMSE:

Msg 6218, Level 16, State 3, Line 1
CREATE ASSEMBLY for assembly 'SQL_CLR' failed because assembly 'SQL_CLR' failed verification. Check if the referenced assemblies are up-to-date and trusted (for external_access or unsafe) to execute in the database. CLR Verifier error messages if any will follow this message

Answer 1

I just encountered exactly the same problem.

This is an old page, but first, formost and finally, the DLL must be built with .NET 2.0. SqlServer 2005 is built with .net 2.0, because that is the latest available when it was written. SqlServer 2008 might also have the same issue.

The DLL and the SqlServer must both reference the same .NET framekwork version. Once I figured this out, I created a separate project under 2.0 and shazam! worked perfect first time.

To see what version of .net your sql server uses:

select * from sys.dm_clr_properties