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Ticket T612159
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Errors on a production server after converting from v15.2 to v17.2

created 7 years ago

[DevExpress Support Team: CLONED FROM Q288030: Can DevExpress products co-exist and be used on a single machine or project?]
Hi Team,
I am deploying the latest (v17.2) DevExpress assemblies into the GAC onto my production server, having converted one my we apps to v17.2 from v15.2 but now I am getting this issue.

CS0433: The type 'DevExpress.Web.ASPxHiddenField' exists in both 'c:\Windows\Microsoft.NET\assembly\GAC_MSIL\DevExpress.Web.v17.2\v4.0_17.2.3.0__b88d1754d700e49a\DevExpress.Web.v17.2.dll' and 'c:\Windows\Microsoft.NET\assembly\GAC_MSIL\DevExpress.Web.v15.2\v4.0_15.2.4.0__b88d1754d700e49a\DevExpress.Web.v15.2.dll'

I thought it was possible to run multiple major versions side by side ?
Can you help ?

Thanks,
Damien.

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Answers approved by DevExpress Support

created 7 years ago

Hello Damien,

Yes, it is possible to have two different major versions side by side. The only requirements is to avoid two versions in the same project.
As for the issue, it looks like it is related to the fact that assemblies from different versions are located in the same project. I recommend you check your project and remove unnecessary assemblies and references (if they exist). Also, clear temporary ASP.NET files using the approach from the How to resolve issues after updating DevExpress controls: Type 'X' exists in both assemblies vs Type 'X' is ambiguous in namespace 'Y' KB article.
If this doesn't help, feel free to provide me with your sample project.

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