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Editorial Team
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Asked: 2026-05-26T03:12:15+00:00

Running this command: CREATE ASSEMBLY [System.Web] from ‘C:\Windows\Microsoft.NET\Framework\v2.0.50727\system.web.dll’ with permission_set = UNSAFE Gives me

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Running this command:

CREATE ASSEMBLY 
[System.Web] from
'C:\Windows\Microsoft.NET\Framework\v2.0.50727\system.web.dll'
with permission_set = UNSAFE

Gives me this error:

Msg 10300, Level 16, State 2, Line 1

Assembly ‘System.Web’ references assembly ‘system.web, version=2.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a.’, which is not present in the current database. SQL Server attempted to locate and automatically load the referenced assembly from the same location where referring assembly came from, but that operation has failed (reason: version, culture or public key mismatch). Please load the referenced assembly into the current database and retry your request.

… this sounds a little silly. It seems like SQL Server thinks that the System.Web assembly is referencing it’s self. How can I fix this?

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1 Answer

  1. Editorial Team

    Turns out System.web.dll isn’t supported for this. In fact, it turned out that loading DLLs into SQL Server like this (for CLR) was a bad idea on many levels (one of which was 64/32-bit support between deployments).

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