Question

I want to access the thread from other function in the same class.
For example

private void timer1_Tick(object sender, EventArgs e)
{
    Thread thread1 = new Thread(new ThreadStart(Send1));
    thread1.Start();
}

private void stop_btn_Click(object sender, EventArgs e)
{
     thread1.Stop();
}

I wan to access thead1 from stop_btn_Click event. Both functions are in the same class Form1.

Answer 1

Declare private Thread thread1; on the class level rather than method

class ClassName
{
    private Thread workerThread = null;

    private void timer1_Tick(object sender, EventArgs e)
    {
        this.workerThread = new Thread(new ThreadStart(Send1));
        workerThread.Start();
    }

    private void stop_btn_Click(object sender, EventArgs e)
    {
         this.workerThread.Stop();
    }
}

By looking at the method name timer1_Tick() I can assume that you are simulating a timer behaviour. Take a look at the System.Timers.Timer and System.Threading.Timer classes perhaps you’ll find them more useful for your case.