Using System.XML Version 2.00 vs System.XML Version 4.00

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Dynamics Community,

I've been searching for information about the differences in using the .NET Variable System.XML version 2.00 vs version 4.00 and which variable version is compatible with what .NET Framework Version. This info has come to our attention because we were having a lot of issues consuming web services in a Dynamics NAV 2013 R2, Windows 7, .NET Framework 4.6.1 enviroment.

The main issue presented was that we were having the following error A call to System.Xml.XPathNodeList.SelectSingleNode failed.... on that enviroment. The same codeunit was working fine in an enviroment with .NET Framework 4.5. In both enviroments we where using the .NET Variable System.XML Version 2.00 then we found out that there was a newer version of that System.XML variable (v. 4.00) so we made the switch on the codeunit running on the .NET Framework 4.6.1 and the errors disappeared.

Is there any documentation on any bugs or when to use the version 2.00 vs 4.00?

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Suresh Kulla 50,243 Super User 2025 Season 2 on at

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There is not specific documentation to specify the differences especically at namespace or class level. I just recommend to use the latest framework that comes with the installation.

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Zaid Tariq 2,274 on at

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Hi,
There is always recommend to use the .Net framework which is most compatible(mostly latest) with the .Net version of NAV Server running on.

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RockwithNav 8,637 Super User 2025 Season 2 on at

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Marcelo,

Actually you will never find these kind of documentation anywhere because you have just mentioned a single Dotnet variable here but if you will do a lookup you will find a a bunch of Assemblies then Namespaces followed by Classes in NAV and if Microsoft go on documenting all these then I believe that will be a new Project for them altogether. :)

So its always recommended to use the latest versions of whatever DLL'S you are using, eventually your all needs will be fulfilled followed by you will find many new methods added.

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