.NET基本類庫：
System，System.CodeDom，System.Collections,System.ComponentModel, System.Diagnostics, System.Drawing, System.Globalization, System.IO, System.Net, System.Reflection, System.Runtime, System.Security, System.Text, System.Threading
ASP.NET:
System.Web, System.Web.Extensions
Windows Forms：
System.Windows.Forms
Windows Presentation Foundation：
System.Windows
ADO.NET和 XML：
System.Data
System.Xml
