public override string GetErrorMessage(
	CommandLineArgument argument,
	Object? value
)Public Overrides Function GetErrorMessage ( 
	argument As CommandLineArgument,
	value As Object
) As String
Dim instance As ValidateNotNullAttribute
Dim argument As CommandLineArgument
Dim value As Object
Dim returnValue As String
returnValue = instance.GetErrorMessage(argument, 
	value)public:
virtual String^ GetErrorMessage(
	CommandLineArgument^ argument, 
	Object^ value
) overrideUse a custom LocalizedStringProvider class that overrides the LocalizedStringProviderNullArgumentValue(String) method to customize this message.