ProcessStepTimeout.cs

gistfile1.txt

var totalTimeout = Observable
                .Throw<TimeoutException>(new TimeoutException("my own text"))
                .DelaySubscription(TimeSpan.FromSeconds(10));
                
var processStepTimeout = Observable
                .FromEventPattern(btn_nextStep, nameof(btn_nextStep.Click))
                .Timeout(TimeSpan.FromSeconds(3));
var sub = totalTimeout.Amb(processStepTimeout).Subscribe(ex => {}, ex => MessageBox.Show(ex.Message));