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Why using directive is unnecessary?
“Using directive is unnecessary” means that nothing in the current C# code file is referencing a non-namespace qualified type in the namespace of the using directive. To fix this warning you either need to remove the using directive or add some code that uses a type in the namespace the using statement refers to.
Are you missing a using directive or an assembly reference Visual Studio?
Re: are you missing a using directive or an assembly reference?
- Open your Project within the Solution Explorer.
- Right-click the References folder and Choose Add Reference….
- Find and select the assembly that cooresponds to your error message or class.
- Click the Ok button to add it to your Project.
Where is NuGet package restore?
Enable package restore by choosing Tools > Options > NuGet Package Manager. Under Package Restore options, select Allow NuGet to download missing packages. In Solution Explorer, right click the solution and select Restore NuGet Packages.
How to fix missing using directive in C #?
You need to look in the solution explorer and right click on project references and then go to add -> and look up the one you need. It’s most likely the System.Configuration assembly as most people have pointed out here while should be under the Framework option in the references window. That should resolve your issue.
Where does the using directive appear in a file?
The scope of a using directive is limited to the file in which it appears. The using directive can appear: At the beginning of a source code file, before any namespace or type definitions. In any namespace, but before any namespace or types declared in this namespace.
What are the uses of using directive in C #?
using Directive (C# Reference) The using directive has three uses: To allow the use of types in a namespace so that you do not have to qualify the use of a type in that namespace: using System.Text; To allow you to access static members and nested types of a type without having to qualify the access with the type name.
When to use using Alias in using directive?
Create a using alias directive to make it easier to qualify an identifier to a namespace or type. In any using directive, the fully-qualified namespace or type must be used regardless of the using directives that come before it. No using alias can be used in the declaration of a using directive.