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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.diagnostics.tracelistener.fail below:

TraceListener.Fail Method (System.Diagnostics) | Microsoft Learn

Source:: TraceListener.cs

Source:: TraceListener.cs

Source:: TraceListener.cs

Source:: TraceListener.cs

Emits an error message and a detailed error message to the listener you create when you implement the TraceListener class.

public:
 virtual void Fail(System::String ^ message, System::String ^ detailMessage);

public virtual void Fail(string? message, string? detailMessage);

public virtual void Fail(string message, string detailMessage);

abstract member Fail : string * string -> unit
override this.Fail : string * string -> unit

Public Overridable Sub Fail (message As String, detailMessage As String)

Parameters

message: String

A message to emit.

detailMessage: String

A detailed message to emit.

Remarks

The default behavior is to display the message and detailed message in a message box when the application is running in a user-interface mode, and to the TraceListener instances in a TraceListenerCollection collection. By default, the TraceListenerCollection collection has an instance of a DefaultTraceListener. You can customize this behavior by adding a TraceListener to or removing one from the collection.