NP126 missing using statements in “Add Reference…”

Question

Hi Guys

Though following using statements are in VS IDE Form designing code some using statements (highlighted in yellow) are missing in the “Add Reference…”. I wish to know the reason. Please explain the reason.

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

Thank you

Alan · Answer

The System.ComponentModel namespace is included in System.dll but System.Collections is in mscorlib.dll. The latter is included in all .NET projects by default though it's not listed in the Visual Studio Solution Explorer because the compiler adds it automatically.

Maha · Answer

Thank you very much for your explanation.

Ryan Alford · Answer

not all namespaces require their own reference to be added. I believe the two you highlighted are referenced in the System reference.