Turn off screen updating while I fill a RichTextBox

[=?Utf-8?B?ZG1idXNv?=]

I am filling a richtextbox via the AppendText method and it works great.
However, I would like to to off screen updating, add my 50 or so lines to the
richtextbox, and then turn screen updating back on.

How do I do this? SuspendLayout does not do this.

Thanks.
--
Dave B.

[Walter Wang [MSFT]]

Hi Dave,

You can use WM_SETREDRAW message to do this. Refer to following FAQ entry:

#Windows Forms FAQ - Windows Forms
http://msdn2.microsoft.com/en-us/net.../aa497373.aspx
How do I suspend painting a form until all its controls are initialized?

There is not currently a way to do this built into the framework, but
WM_SETREDRAW will do what you're looking for:

[ DllImport( "user32" ) ]
private static extern bool SendMessage( IntPtr hWnd, int msg,
int wParam, int lParam );
private const int WM_SETREDRAW = 0xB;

int paintFrozen;

private bool FreezePainting
{
get { return paintFrozen 0; }
set
{
if ( value && IsHandleCreated && Visible )
if ( 0 == paintFrozen++ )
SendMessage( Handle, WM_SETREDRAW, 0, 0 );

if ( !value )
{
if ( paintFrozen == 0 ) return;
if ( 0 == --paintFrozen )
{
SendMessage( Handle, WM_SETREDRAW, 1, 0 );
Invalidate( true );
}
}
}
}
Hope this helps.
Sincerely,
Walter Wang (wa****@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscripti...ult.aspx#notif
ications. If you are using Outlook Express, please make sure you clear the
check box "Tools/Options/Read: Get 300 headers at a time" to see your reply
promptly.

Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at
http://msdn.microsoft.com/subscripti...t/default.aspx.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

[Walter Wang [MSFT]]

Hi Dave,

Does the above suggestion work for you? Please feel free to let me know if
there's anything unclear. Thanks.
Regards,
Walter Wang (wa****@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.