async await not working

[btb900]

I am doing this :

async Task MoveWaferAsync(double X, double Y )
{



try
{
List<Task> ThreadList = new List<Task>();

ThreadList.Add( moveXTask(X));
ThreadList.Add( moveYTask(Y));
Task.WaitAll(ThreadList.ToArray());


}
catch (Exception err)
{
AppendDisplayBox(err.Message);

}


}



but it is doing them one at a time ...

why ?

async Task moveXTask (double X)
{

try
{
await Xstage.MoveAbsoluteAsync(X);

}
catch ( Exception err)
{
if (err.Message == "Motor timed out before action was completed")
{
double Xlocation = Math.Abs((Xstage.GetPosition() - X));
if (Xlocation > 1.1)
{
// MessageBox.Show(err.Message + "Motor might not be in the right location");


}
await Xstage.resetMotor();
}
else
{
// MessageBox.Show(err.Message);
}
}


}


async Task moveYTask(double Y)
{

try
{
await Ystage.MoveAbsoluteAsync(Y);

}
catch (Exception err)
{
if (err.Message == "Motor timed out before action was completed")
{
double Ylocation = Math.Abs((Ystage.GetPosition() - Y));
if (Ylocation > 1.1)
{
// MessageBox.Show(err.Message + "Motor might not be in the right location");

}

await Ystage.resetMotor();
}
else
{
// MessageBox.Show(err.Message);
}
}

}


I want them to happen at the same time, then move on ...

why is that not working ???

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