How to refer to Assembly in Visual Studio?

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I was trying to create an application that connects with a database. But the methods of SqlConnection.Open(), SqlConnection.State and SqlConnection.Close() are with errors all appear the message:

The "Component" type is defined in an Assembly that is not referenced, you must add a reference to Assembly[...] Erro

c# sql-server visual-studio

  • Dependencies => assemblies => right-click => add

  • You do not have "Add".

  • In dependencies you must have. Somewhere you need to have this, just make a little effort you think.

  • I did, but how to know which dependency needs to be added?

  • See my answer

  • Already solved your problem?

  • No, I gave up, created a new project and this error did not appear anymore.

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You need to add the file System.Data.dl to your project.

Click dependencies, add and choose the Assembly.

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