How to pause/suspend a thread then continue it?

Question

I am making an application in C# which uses a winform as the GUI and a separate thread which is running in the background automatically changing things. Ex:

Answer 1

var mrse = new ManualResetEvent(false);

public void Run() 
{ 
    while (true) 
    { 
        mrse.WaitOne();
        printMessageOnGui("Hey"); 
        Thread.Sleep(2000); . . 
    } 
}

public void Resume() => mrse.Set();
public void Pause() => mrse.Reset();