Removing flash during resize

[AndrusM]

If window is resized, listbox flashes. how to remove flash during resize ?

using System;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Drawing;

public class Test
{
static void Main()
{
Application.Run(new ReportDialogForm());
}
}

class ReportDialogForm : Form
{

public ReportDialogForm()
{
    tabControl1 = new TabControl();
    tabPage1 = new TabPage();
    reportListBox = new ListBox();
    tabControl1.Anchor = ((AnchorStyles)((((AnchorStyles.Top | AnchorStyles.Bottom)
                            | AnchorStyles.Left)
                            | AnchorStyles.Right)));
    tabControl1.Controls.Add(tabPage1);
    tabControl1.Location = new Point(0, 0);
    tabControl1.Padding = new Point(0, 0);
    tabControl1.SelectedIndex = 0;
    tabControl1.Size = new Size(591, 296);
    tabControl1.TabIndex = 0;
    tabPage1.Controls.Add(reportListBox);
    tabPage1.Location = new Point(4, 29);
    tabPage1.Margin = new Padding(0);
    tabPage1.Size = new Size(583, 263);
    tabPage1.TabIndex = 0;
    tabPage1.Layout += new LayoutEventHandler(tabPage1\_Layout);
    reportListBox.Anchor = AnchorStyles.None;
    reportListBox.Size = new Size(287, 384);
    reportListBox.TabIndex = 1000;
    ClientSize = new Size(588, 292);
    Controls.Add(tabControl1);

    for (int i = 0; i < 100; i++)
        reportListBox.Items.Add(  "MMMMMMMMMMMMMMMMMMMMMM");

    Load += new EventHandler(ReportDialogForm\_Load);
}

void ReportDialogForm\_Load(object sender, EventArgs e)
{
    StartPosition = FormStartPosition.Manual;
    Location = new Point(10, 10);
    ClientSize = new Size(400, 400);
}



void tabPage1\_Layout(object sender, LayoutEventArgs e)
{
    SuspendLayout();
    int height = 100;
    reportListBox.Top = height;
    reportListBox.Height = tabPage1.Height - height;
    reportListBox.Width = tabPage1.Width / 2;
    reportListBox.Left = 0;
    ResumeLayout();
}

TabControl tabControl1;
TabPage tabPage1;
ListBox reportListBox;

}

Andrus

[Jordanwb]

In the form's properties there's an option "DoubleBuffered" try setting it to true.

[AndrusM]

Thank you. I added DoubleBuffered = true; as first line in constructor:

public ReportDialogForm()
{
    DoubleBuffered = true;

...

However, listbox still blinks on resize. Adding DoubleBuffered did not make any difference.

Andrus