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Build errors while adding SQL Server 2025 (Version - 17.x)

Abhishek Modi (amodi) 20 Reputation points
2026-01-12T15:16:17.6266667+00:00

Hi Team,

I have installed SQL Server 2025 (Version 17.0.1000.7), and I am updating a project to add support for SQL Server 2025. For this, I need two processor architecture MSIL assemblies: Microsoft.SqlServer.Smo.dll and Microsoft.SqlServer.SqlEnum.dll, with versions greater than or equal to 17.0.1000.7.

However, the highest version I am able to find on in "C:\Windows\Microsoft.NET\assembly\GAC_MSIL" is 17.0.74.0, which is lower than what is required. As a result, I am getting the following build errors:

Code

  • error CS1705: Assembly 'Microsoft.SqlServer.MaintenancePlanTasks, Version=17.0.0.0, Culture=neutral' uses 'Microsoft.SqlServer.Smo, Version=17.100.0.0, Culture=neutral' which has a higher version than referenced assembly 'Microsoft.SqlServer.Smo, Version=17.0.0.0, Culture=neutral'
  • error CS1705: Assembly 'Microsoft.SqlServer.MaintenancePlanTasks, Version=17.0.0.0, Culture=neutral' uses 'Microsoft.SqlServer.SqlEnum, Version=17.100.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' which has a higher version than referenced assembly 'Microsoft.SqlServer.SqlEnum, Version=17.0.0.0, Culture=neutral'

Could you please provide guidance?

Can you please advise where I can obtain the required versions (17.100.0.0 or higher) of Microsoft.SqlServer.Smo.dll and Microsoft.SqlServer.SqlEnum.dll for SQL Server 2025 in processor architecture GAC MSIL (i.e. - in "C:\Windows\Microsoft.NET\assembly\GAC_MSIL" )?

Thank you in advance for your help!

Thanks,

Abhishek

SQL Server Integration Services

1 answer

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  1. Shruti Dhruv 640 Reputation points Microsoft External Staff Moderator
    2026-01-13T16:14:09.9966667+00:00

    Hi Abhishek,

    Welcome to Microsoft Q&A Forum!

    As per official document, Microsoft recommends developers use the Microsoft.SqlServer.SqlManagementObjects NuGet package instead of relying on MSIL GAC assemblies. It includes:

    • SMO assemblies (Smo.dll, SqlEnum.dll, etc.)
    • Versioning aligned to SQL Server compatibility
    • Strong-named and Authenticode signed DLLs

    Refer- https://learn.microsoft.com/en-us/sql/relational-databases/server-management-objects-smo/installing-smo?view=sql-server-ver17

    Latest AvailableVersion:
    https://www.nuget.org/packages/Microsoft.SqlServer.SqlManagementObjects

    It targets version 18.x, which may include newer functionality than SQL Server 2025, but is fully compatible.
    If GAC-based deployment is mandatory, wait for SQL Server 2025 Feature Pack or SharedManagementObjects.msi, which will install v17.100+ assemblies and avoid mixing GAC and NuGet references—they will cause version conflict and build errors.

    Hope this helps!
    Regards,
    Shruti

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