What is the proper way to declare a Microsoft class to use in my code. The quick and dirty way I am doing it here, I know, is not correct

Unity Engine
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1

What is the proper way to declare a Microsoft class to use in my code. The quick and dirty way I am doing it here, I know, is not correct

Microsoft SharePoint.Client.List newList = null;

I think it is something like this

Microsoft.SharePoint.Client.List newList = new Microsoft.SharePoint.Client.List();

2

Is this a C# syntax thing, or trying to use Microsoft libraries that probably aren’t included in Unity?