"Remove unnecessary usings" not working in Visual Studio 2015 -

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i have solution few projects. remove unnecessary usings working in projects except one.

why remove unnecessary usings command not work in projects?

edit - can see in before image there no remove unnecessary usings command , if try right-click in file, organize usings > remove unnecessary usings nothing. after setting project build warning level 4 remove unnecessary usings command appears , works.

before:

before

after:

after

in build section of project properties there setting called errors , warnings should 4.

enter image description here


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