How to Stop Button running Event by Clicking another button.

Threads are possible, but not necessary. Threading[^] may be necessary because of other circumstances. But simply killing a thread to stop a background operation may result in issues described here[^].

The start button starts a method. The stop button cannot directly stop this method. But the method can be created with the possibility in mind that there may be a need to stop it.

To implement this, the method has to repeatedly check if it should continue. Looping or recoursive methods can easily be built that way.

private bool continue = true;


private void StopButton_Click(object sender, EventArgs e)
{
    continue = false;
}


private void StartButton_Click(object sender, EventArgs e)
{
    continue = true;
    LoopThroughNumbers(); // or RecourseThroughNumbers(0);
}


private void LoopThroughNumbers()
{
    for(int i = 0; i < 10000; i++)
    {
        if(!continue)
        {
            break;
        }
        
        DoSomethingWith(i);
    }
}


private void RecourseThroughNumbers(int i)
{
    if(!continue)
    {
        return;
    }

    if(i >= 10000)
    {
        return;
    }

    DoSomethingWith(i);
    RecourseThroughNumbers(i + 1);
}