Hi Richard,

The ListView in .NET 1.x doesn't support double buffering. So it's no use
setting the DoubleBuffer style to true for the ListView in .NET 1.x.

In fact, the reason why the ListView flickers when it is updated frequently
is that the WM_ERASEBKGND message is sent to the ListView every time the
ListView needs redrawing. Thus, the ListView items are erased with the back
color first and then redraw the text in them.

To reduce the flickering, we can intercepting the WM_ERASEBKGND message in
the WndProc method of a ListView derived class and clip all the bounds of
the ListView items out of the drawing region, so that the bounds of the
ListView items will not erased with back color and the flickering
disappears.

The following is a sample code:

using System.Windows.Forms;
using System.Drawing;

public class MyListView:ListView
{       
               int WM_ERASEBKGND=0x14;
       
               protected override void WndProc(ref Message m)
    {
        if(m.Msg == WM_ERASEBKGND)
        {
            Color backColor = Enabled ? BackColor :
Color.FromKnownColor(KnownColor.Control);
            // create a graphics object using the supplied handle to the device
context.
            Graphics graphics = Graphics.FromHdc(m.WParam);
            // clip all of the list view items out of the drawing region
            foreach (ListViewItem item in Items)
            {
                graphics.ExcludeClip(new Rectangle(item.Bounds.Left +
2,item.Bounds.Top,item.Bounds.Width-2,item.Bounds.Height));
            }
            // now paint what's left with the background color
            using(SolidBrush brush = new SolidBrush(backColor))
            {
                graphics.FillRegion(brush, graphics.Clip);
                graphics.Dispose();
            }
        }
        else
        {
            base.WndProc (ref m);
        }
    }
   
}

The above code works well on my side. Please try it in your project to see
if it could solve the problem and let me know the result.

Sincerely,
Linda Liu
Microsoft Online Community Support

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