c# check if task is running

How about

Task t = Task.Run(() => ...);

if(t.Status.Equals(TaskStatus.Running))
{
    //task is running
}

Basically I would store my tasks somewhere and make them accessible for other classes. Then you can check the status of the task with the code above. Refer to the TaskStatus-Documentation.

This is what worked for me.

Task t = Task.Run(() => ...);

if(t.IsCompleted.Equals(false))  // or if(t.Status.Equals(TaskStatus.WaitingForActivation)
{
}