Namespaces are treated as containers for all classes. Namespaces are
classified into several categories, based on the functionality of
their classes. For example, if you need to work with databases, you
have to call the System.Data namespace. Similarly, if you work with
files, you have to call the System.IO namespace.
Namespaces in C# are similar to packages in Java, where we use a
statement such as java.sql.*. Moreover, all C# programs should call
the System namespace. This is the root of all other namespaces in the
.NET Framework.
You have to apply the namespaces by following certain conventions as
laid out by the .NET Framework. All namespaces should be called in
your programs by applying the using keyword.
A list of important .NET namespaces is shown in the following table:
System.Collections
System.IO
System.Data
System.Net
System.Data.OleDb
System.Reflection
Stsrem.Data.SqlClient
System.Runtime.InteropServices
System.Data.OracleClient
System.Runtime.Remoting
System.Diagnostics
System.Security
System.Drawing
System.Threading
System.Drawing.Drawing2D
System.Web
System.Drawing.Printing
System.Xml
System.Windows.Forms
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