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articles/data-lake-analytics/dotnet-upgrade-troubleshoot.md

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title: How to troubleshoot the Azure Data Lake Analytics U-SQL job failures because of .NET 4.7.2 upgrade
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description: 'Troubleshoot U-SQL job failures because of the upgrade to .NET 4.7.2.'
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title: How to troubleshoot the Azure Data Lake Analytics U-SQL job failures because of .NET Framework 4.7.2 upgrade
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description: 'Troubleshoot U-SQL job failures because of the upgrade to .NET Framework 4.7.2.'
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services: data-lake-analytics
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author: guyhay
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ms.author: guyhay
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This upgrade from .NET Framework 4.5.2 to version 4.7.2 means that the .NET Framework deployed in a U-SQL runtime (the default runtime) will now always be 4.7.2. There isn't a side-by-side option for .NET Framework versions.
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After this upgrade to .NET 4.7.2 is complete, the system’s managed code will run as version 4.7.2, user provided libraries such as the U-SQL custom assemblies will run in the backwards-compatible mode appropriate for the version that the assembly has been generated for.
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After this upgrade to .NET Framework 4.7.2 is complete, the system’s managed code will run as version 4.7.2, user provided libraries such as the U-SQL custom assemblies will run in the backwards-compatible mode appropriate for the version that the assembly has been generated for.
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- If your assembly DLLs are generated for version 4.5.2, the deployed framework will treat them as 4.5.2 libraries, providing (with a few exceptions) 4.5.2 semantics.
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- You can now use U-SQL custom assemblies that make use of version 4.7.2 features, if you target the .NET Framework 4.7.2.
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Because of this upgrade to .NET 4.7.2, there's a potential to introduce breaking changes to your U-SQL jobs that use .NET custom assemblies. We suggest you check for backwards-compatibility issues using the procedure below.
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Because of this upgrade to .NET Framework 4.7.2, there's a potential to introduce breaking changes to your U-SQL jobs that use .NET custom assemblies. We suggest you check for backwards-compatibility issues using the procedure below.
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## How to check for backwards-compatibility issues
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