The Object base class

In the .NET Framework, all types are derived from System.Object. That relationship helps establish the common type system used throughout the .NET Framework

Using Value Types

The simplest types in the .NET Framework, primarily numeric and boolean types, are
value types. Value types are variables that contain their data directly instead of containing
a reference to the data stored elsewhere in memory. Instances of value types are
stored in an area of memory called the stack, where the runtime can create, read,
update, and remove them quickly with minimal overhead.

There are three general value types:

• Built-in types
• User-defined types
• Enumerations

Each of these types is derived from the System.ValueType base type.