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private void dataGridView1_MouseDown(object sender, MouseEventArgs e)

        {

            DoDragDrop("dummyDragDrop", DragDropEffects.All);

        }

        private void dataGridView2_DragEnter(object sender, DragEventArgs e)

        {

            e.Effect = DragDropEffects.All;

        }

        private void dataGridView2_DragDrop(object sender, DragEventArgs e)

        {

            dataGridView2.Rows.Clear();
 

            if (dataGridView1.SelectedRows.Count > 1)

            {

                dataGridView2.Rows.Add(dataGridView1.SelectedRows.Count);

            }

            else { dataGridView2.Rows.Add();

            }

 

            for (int i = 0; i <= dataGridView1.SelectedRows.Count; i += 1)

            {

                dataGridView2.Rows[i].Cells[0].Value = dataGridView1.SelectedRows[i].Cells[0].Value;

                dataGridView2.Rows[i].Cells[1].Value = dataGridView1.SelectedRows[i].Cells[1].Value;

            }   

        }					

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        private void productDataGridView_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mouseDown = true; //Boolean
                dragStartPoint = new Point(e.X, e.Y); //Point
            }
        }

        private void productDataGridView_MouseMove(object sender, MouseEventArgs e)
        {
            if ((mouseDown) && (!dragStarted))
            {
                //Check distance
                int xDiff = (dragStartPoint.X - e.X);
                int yDiff = (dragStartPoint.Y - e.Y);
                xDiff = xDiff * xDiff; //Integers
                yDiff = yDiff * yDiff;
                if (xDiff < 25 && yDiff < 25)
                    return;
                else
                {
                    dragStarted = true;
                    productDataGridView.DoDragDrop(GetSelectedProduct(), DragDropEffects.Link);
                }
            }
        }

        private void productDataGridView_MouseUp(object sender, MouseEventArgs e)
        {
            mouseDown = false;
            if (dragStarted)
            {
                dragStarted = false;
            }
        }