public sealed class NDC

Public NotInheritable Class NDC

public ref class NDC sealed

[<SealedAttribute>]
type NDC =  class end

The NDC type exposes the following members.

	Name	Description
	Depth	Gets the current context depth.

	Name	Description
	Clear	Clears all the contextual information held on the current thread.
	CloneStack	Creates a clone of the stack of context information.
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	Inherit	Inherits the contextual information from another thread.
	Pop	Removes the top context from the stack.
	Push	Pushes a new context message.
	PushFormat	Pushes a new context message.
	Remove	Removes the context information for this thread. It is not required to call this method.
	SetMaxDepth	Forces the stack depth to be at most maxDepth.
	ToString	Returns a String that represents the current Object. (Inherited from Object.)

Note
The NDC is deprecated and has been replaced by the Stacks. The current NDC implementation forwards to the ThreadContext.Stacks["NDC"].

A Nested Diagnostic Context, or NDC in short, is an instrument to distinguish interleaved log output from different sources. Log output is typically interleaved when a server handles multiple clients near-simultaneously.

Interleaved log output can still be meaningful if each log entry from different contexts had a distinctive stamp. This is where NDCs come into play.

Note that NDCs are managed on a per thread basis. The NDC class is made up of static methods that operate on the context of the calling thread.

using(NDC.Push("my context message"))
{
    ... all log calls will have 'my context message' included ...

} // at the end of the using block the message is automatically removed

Reference