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Posted 23 Jan 2005

Full Screen Mode in C#

, 23 Jan 2005
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An easy way to enter into full screen mode.


There are situations where you want your application to go into a full screen presentation mode. This mode usually covers the whole desktop with a black background and the application sits in the middle of the screen.

How to do it?

I am presenting a simple solution using C#. In this application, I have made the application accept F11 as the toggle key to go into full screen mode and to revert back to its original state. To accomplish that, I set the KeyPreview property of the form to true.

When the F11 key is pressed, I create another form that has its WindowState property set to Maximized, the background color is set to Black.

The trick here is to set the main application's form's owner to that of the second form. By setting the Owner property, Windows will display the application on top of the black background window. The last thing to do is to set the FormBorderStyle of the main form to None.

private void Form1_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e)
   if ( e.KeyData == Keys.F11)
      if (_bFullScreenMode == false)
           Form2 f = new Form2();
           this.Owner = f;
           this.FormBorderStyle = FormBorderStyle.None;
           this.Left = (Screen.PrimaryScreen.Bounds.Width/2 - this.Width/2);
           this.Top = (Screen.PrimaryScreen.Bounds.Height/2 - this.Height/2);
           _bFullScreenMode = true;
           f.KeyUp +=new KeyEventHandler(Form1_KeyUp);
           Form f = this.Owner;
           this.Owner = null;
           this.FormBorderStyle = FormBorderStyle.Sizable;
           _bFullScreenMode = false;


Here is just a simple method for an application to enter to a full screen mode without writing a lot of resizing code in the main application.


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Comments and Discussions

QuestionHow to resize a fullscreen background image Pin
Gaurav Panchal13-May-13 14:37
memberGaurav Panchal13-May-13 14:37 
GeneralMy vote of 1 Pin
gioakim19-Oct-10 0:49
membergioakim19-Oct-10 0:49 
QuestionWhat about multiple monitors Pin
Dave Midgley21-Sep-10 2:25
memberDave Midgley21-Sep-10 2:25 
GeneralMy 5 cents [modified] Pin
Andrew17-Nov-09 11:32
memberAndrew17-Nov-09 11:32 
GeneralRe: My 5 cents [modified] Pin
wvd_vegt4-Nov-11 1:33
professionalwvd_vegt4-Nov-11 1:33 
GeneralMy vote of 1 Pin
Jimmanuel26-Feb-09 5:50
memberJimmanuel26-Feb-09 5:50 
GeneralThere is already a built in propety for this! Pin
Yazeed Hamdan1-Jan-09 5:58
memberYazeed Hamdan1-Jan-09 5:58 
NewsI prefer: Pin
Sidneys14-Sep-08 10:13
memberSidneys14-Sep-08 10:13 
GeneralRe: I prefer: Pin
Vercas29-Oct-10 7:20
memberVercas29-Oct-10 7:20 
GeneralFlashing Forms Issue in CF2.0 Pin
Hani0721-Sep-07 5:17
memberHani0721-Sep-07 5:17 
QuestionNot really fullscreen mode application? Pin
Gunn31713-Feb-06 4:28
memberGunn31713-Feb-06 4:28 
AnswerRe: Not really fullscreen mode application? Pin
Rob Magee10-May-06 11:21
memberRob Magee10-May-06 11:21 
GeneralRe: Not really fullscreen mode application? Pin
bebangs27-Jun-06 23:48
memberbebangs27-Jun-06 23:48 
GeneralRe: Not really fullscreen mode application? Pin
bebangs28-Jun-06 2:04
memberbebangs28-Jun-06 2:04 
GeneralRe: Not really fullscreen mode application? Pin
nonnb6-Feb-07 19:19
membernonnb6-Feb-07 19:19 
GeneralSecond once on F11 !!! Pin
CSharpJSharp24-Dec-05 1:45
memberCSharpJSharp24-Dec-05 1:45 
GeneralRe: Second once on F11 !!! Pin
Gunn31713-Feb-06 4:23
memberGunn31713-Feb-06 4:23 
GeneralKeyCapture Pin
eggie523-Jan-05 16:41
membereggie523-Jan-05 16:41 
GeneralRe: KeyCapture Pin
slingman23-Jan-05 17:34
memberslingman23-Jan-05 17:34 
GeneralRe: KeyCapture Pin
eggie523-Jan-05 18:13
membereggie523-Jan-05 18:13 
GeneralRe: KeyCapture Pin
slingman24-Jan-05 11:15
memberslingman24-Jan-05 11:15 
GeneralRe: KeyCapture Pin
eggie524-Jan-05 13:57
membereggie524-Jan-05 13:57 

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