public sealed class NDC

public sealed class NDC

Public NotInheritable Class NDC

Public NotInheritable Class NDC

public ref class NDC sealed

public ref class NDC sealed

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The NDC is deprecated and has been replaced by the Stacks.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

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