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I'm currently writing an application that will control positioning of a measurement device. Because of the hardware involved I need to poll for the current position value constantly while running the electric motor. I'm trying to build the class responsible for this so that it does the polling on a background thread and will raise an event when the desired position is reached. The idea being that the polling won't block the rest of the application or the GUI. I wanted to use the new Threading.Task.Task class to handle all the background thread plumbing for me. I haven't got the hardware yet, but have build a test stub to simulate this behavior. But when I run the application like this the GUI still blocks. See a simplified example of the code below (not complete and not using separate class for device control). The code has a sequence of measurement steps, the application has to position and then measure for each step. public partial class MeasurementForm: Form { private MeasurementStepsGenerator msg = new MeasurementsStepGenerator(); private IEnumerator<MeasurementStep> steps; // actually through events from device control class private void MeasurementStarted() { // update GUI } // actually through events from device control class private void MeasurementFinished() { // store measurement data // update GUI BeginNextMeasurementStep(); } private void MeasurementForm_Shown(object sender, EventArgs e) { steps = msg.GenerateSteps().GetEnumerator(); BeginNextMeasurementStep(); } ... ... private void BeginNextMeasurementStep() { steps.MoveNext(); if (steps.Current != null) { MeasurementStarted(); MeasureAtPosition(steps.Current.Position); } else { // finished, update GUI } } // stub method for device cont

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