nested for loop and using threading

See more:

C#3.5

threads

Dear all

First about my app

i have two listviewitem that have numbers value and i want the first item in the first listview sum with the first 5 number in the second listview (number by number)but between this operation i want this operation sleep 1 min and when it sleep , the second number in the first listview sum with the second 5 number in the
second listview (number by number) and ........etc

this is my code but without using threading and calculate only message box to check the code work correctly

private void button3_Click(object sender, EventArgs e)
        {
 int inc = 0;

            for (int i = 0; i < listView1.Items.Count; i++)
            {

                for (int j = 0; j < 5; j++)
                {
                    
                    MessageBox.Show(listView1.Items[j].SubItems[0].Text + "  To  " + listView2.Items[inc].SubItems[0].Text);
                   
                    //i want to sleep the above line 1 min and containu the loop 
                    if (inc >= listView2.Items.Count - 1)
                    {
                        inc = 0;
                    }
                    else
                    {
                        inc++;
                    }


                }