How to pause and stop Parallel.Foeach loop in C#

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C#

application

parallel

desktop

Hi Everyone...

I have a Parallel.Foreach loop by which i load a listview , i have a button for stop the execution.Now my question is , when the execution is going on if i push the button then the process will be stopped .I found some code in net but nothing happens.

my code is

 private void btn_Click(object sender, EventArgs e)
{
    try
     {
              
                Parallel.ForEach(this.listView1.Items.Cast<ListViewItem>(),
                (list, loopState) =>
                {       
                  loopState.Stop();       
                });
     }
    catch
     {
     }
   }

what is missing in this code ?
please suggest somethings .

Thanking You
Regards
Animesh Datta