Name Spaces Available in .NET Framework 4:

System
System.Activities Namespaces
System.AddIn Namespaces
System.CodeDom Namespaces
System.Collections Namespaces
System.ComponentModel Namespaces
System.Configuration Namespaces
System.Data Namespaces
System.Deployment Namespaces
System.Device.Location
System.Diagnostics Namespaces
System.DirectoryServices Namespaces
System.Drawing Namespaces
System.Dynamic
System.EnterpriseServices Namespaces
System.Globalization
System.IdentityModel Namespaces
System.IO Namespaces
System.Linq Namespaces
System.Management Namespaces
System.Media
System.Messaging Namespaces
System.Net Namespaces
System.Numerics
System.Printing Namespaces
System.Reflection Namespaces
System.Resources Namespaces
System.Runtime Namespaces
System.Security Namespaces
System.ServiceModel Namespaces
System.ServiceProcess Namespaces
System.Speech Namespaces
System.Text Namespaces
System.Threading Namespaces
System.Timers
System.Transactions Namespaces
System.Web Namespaces
System.Windows Namespaces
System.Workflow Namespaces
System.Xaml Namespaces
System.Xml Namespaces
Accessibility
Microsoft.Aspnet.Snapin
Microsoft.Build Namespaces
Microsoft.CSharp Namespaces
Microsoft.Data.Entity.Build.Tasks
Microsoft.JScript Namespaces
Microsoft.SqlServer.Server
Microsoft.VisualBasic Namespaces
Microsoft.VisualC Namespaces
Microsoft.Win32 Namespaces
Microsoft.Windows.Themes
UIAutomationClientsideProviders
XamlGeneratedNamespace