Run time error when calling Start() method from an Output counter user control in my class.

Question

I am new to DAQmx and .NET.
In my application I need to activate a clock out on counter 2 (HW pci 16 E 4).
I went through all the steps like the sampling examples but instead of Analog input
I used counter output , and setup the pulse ratios.
When I click the switch in the user interface ( a user control databinded to the clock output)
the output works. Since I need to activate it programmatically I tried to call the daQmxUserControl11.Start()
method but this causes the following error :
An unhandled exception of type 'NationalInstruments.DAQmx.DaqException' occurred in nationalinstruments.daqmx.dll
Additional information: Specified operation cannot be performed while the task is running.
Task Name: DAQmxTask1
Status Code: -200479
Any ideas on what am I doing wrong?
Thanks David

Answer 1

Thanks a lot,
I also discovered that dragging the user control onto my user interface doesn't allow alternate activation.
( I actually tried stopping and then starting but the result was the same )
Calling the routines as indicated in the header comments also gave some hiccups ( I had to remark some code to get the system working progrtammatically.
public void Start()
#region Update UI
this.switch1.Caption = "On";
this.switch1.Value = true;
#endregion
daqmxTask.Start();
public void Stop()
#region Update UI
this.switch1.Caption = "Off";
this.switch1.Value = false;
#endregion
daqmxTask.Stop();
#region Methods