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Here's an example

bool _cancel = false; private void count() { new System.Threading.Thread(delegate() { _cancel = false; for (int i = 0; i < 100000; i++) { if (_cancel) break; Console.WriteLine(i); } }).Start(); } private void button1_Click(object sender, EventArgs e) { _cancel = true; } 

Here's an example

bool _cancel = false; private void count() { _cancel = false; new System.Threading.Thread(delegate() { for (int i = 0; i < 100000; i++) { if (_cancel) break; Console.WriteLine(i); } }).Start(); } private void button1_Click(object sender, EventArgs e) { _cancel = true; } 

Here's an example

bool _cancel = false; private void count() { new System.Threading.Thread(delegate() { _cancel = false; for (int i = 0; i < 100000; i++) { if (_cancel) break; Console.WriteLine(i); } }).Start(); } private void button1_Click(object sender, EventArgs e) { _cancel = true; } 

Ideally you will want to put your method on a differnt thread than the UI one to avoid your UI freezing while your method is working.

Here's an example

bool _cancel = false; private void count() { new System.Threading.Thread(delegate() { _cancel = false; for (int i = 0; i < 100000; i++) { if (_cancel) break; Console.WriteLine(i); } }).Start(); } private void button1_Click(object sender, EventArgs e) { _cancel = true; } 

Here's an example

bool _cancel = false; private void count() { _cancel = false; for (int i = 0; i < 100000; i++) { if (_cancel) break; Console.WriteLine(i); } } private void button1_Click(object sender, EventArgs e) { _cancel = true; } 

Ideally you will want to put your method on a differnt thread than the UI one to avoid your UI freezing while your method is working.

Here's an example

bool _cancel = false; private void count() { new System.Threading.Thread(delegate() { _cancel = false;   for (int i = 0; i < 100000; i++)   {   if (_cancel)   break;   Console.WriteLine(i);   } }).Start(); } private void button1_Click(object sender, EventArgs e) { _cancel = true; } 

Ideally you will want to put your method on a differnt thread than the UI one to avoid your UI freezing while your method is working.