When attempting to enable Multilingual app toolkit on a project, nothing happens

Question

When I try to enable the Mulitlingual app toolkit on a C# project, I get an error such as the following and nothing more happens:

Project 'project name' was not enabled - the project's source culture could not be determined.

What's wrong?

Answer 1

Add a line like this to your assemblyinfo.cs file:

[assembly: NeutralResourcesLanguage("en")] 

The indicated language is the one that the application currently uses (i.e usually hardcoded texts, before translation)

Answer 2

For a .Net Standard project, edit the csproj file to add:

<PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <NeutralLanguage>en-US</NeutralLanguage>
</PropertyGroup>

Answer 3

In Visual Studio 2017 => Projects=>Properties=>Package=>Assembly nutral language=>English(...)=>Save Then Select Project in Solution Explorer=>Tools=>Multilingual App Toolkit =>Enable Selection

Update: VS2019

VS2019 has a lot of changes in UI, so to find Assembly Neutral Language Option you can try below solution.

Right Click on Project => Got To Properties => Search button "Assembly Information" => Neutral Language => Select English => Save. And then rest of the process is same Select Project => Tools=> Multilingual App=> Enable Selection