How to display a Windows Form in full screen on top of the taskbar

Question

I have a  net windows application that needs to run in full screen  When the application starts however the taskbar is shown on top of the main form and it only disappears when activating the form by clicking on it or using ALT-TAB  The form s current properties are as follow      WindowState FormWindowState Normal   TopMost Normal   Size 1024 768  this is the screen resolution of the machines it s going to be running on    FormBorderStyle   None   I ve tried adding the followings on form load but none worked for me      this Focus     after giving the focus this Focus property is always false  this BringToFront    this TopMost   true   this however would not be ideal in my scenario  this Bounds   Screen PrimaryScreen Bounds  this Bounds   Screen PrimaryScreen Bounds    Is there a way to do it within  NET or would I have to invoke native windows methods and if so a code snippet would very much be appreciated   many thanks

User · Answer

I ve tried so many solutions  some of them works on Windows XP and all of them did NOT work on Windows 7  After all I write a simple method to do so   private void GoFullscreen bool fullscreen                if  fullscreen                        this WindowState   FormWindowState Normal              this FormBorderStyle   System Windows Forms FormBorderStyle None              this Bounds   Screen PrimaryScreen Bounds                    else                       this WindowState   FormWindowState Maximized              this FormBorderStyle   System Windows Forms FormBorderStyle Sizable                    the order of code is important and will not work if you change the place of WindwosState and FormBorderStyle   One of the advantages of this method is leaving the TOPMOST on false that allow other forms to come over the main form   It absolutely solved my problem

User · Answer

This is how I make forms full screen   private void button1 Click object sender  EventArgs e        int minx  miny  maxx  maxy      inx   miny   int MaxValue      maxx   maxy   int MinValue       foreach  Screen screen in Screen AllScreens                var bounds   screen Bounds          minx   Math Min minx  bounds X           miny   Math Min miny  bounds Y           maxx   Math Max maxx  bounds Right           maxy   Math Max maxy  bounds Bottom              Form3 fs   new Form3        fs Activate        Rectangle tempRect   new Rectangle 1  0  maxx  maxy       this DesktopBounds   tempRect

User · Answer

I m not have an explain on how it works  but works  and being cowboy coder is that all I need           System Drawing Rectangle rect   Screen GetWorkingArea this           this MaximizedBounds   Screen GetWorkingArea this           this WindowState   FormWindowState Maximized

User · Answer

FormBorderStyle   FormBorderStyle Sizable  TopMost   false  WindowState   FormWindowState Normal    THIS CODE MAKE YOUR WINDOWS FULL SCREEN THIS WILL ALSO COVER WHOLE SCREEN

User · Answer

My simple fix it turned out to be calling the form s Activate   method  so there s no need to use TopMost  which is what I was aiming at

User · Answer

I believe that it can be done by simply setting your FormBorderStyle Property to None and the WindowState to Maximized   If you are using Visual Studio both of those can be found in the IDE so there is no need to do so programmatically   Make sure to include some way of closing exiting the program before doing this cause this will remove that oh so helpful X in the upper right corner   EDIT   Try this instead   It is a snippet that I have kept for a long time  I can t even remember who to credit for it  but it works         A function to put a System Windows Forms Form in fullscreen mode    Author  Danny Battison    Contact  gabehabe googlemail com                 a struct containing important information about the state to restore to         struct clientRect                       public Point location              public int width              public int height                        this should be in the scope your class         clientRect restore                  bool fullscreen   false                lt summary gt              Makes the form either fullscreen  or restores it to it s original size location              lt  summary gt          void Fullscreen                         if  fullscreen    false                                this restore location   this Location                  this restore width   this Width                  this restore height   this Height                  this TopMost   true                  this Location   new Point 0 0                   this FormBorderStyle   FormBorderStyle None                  this Width   Screen PrimaryScreen Bounds Width                  this Height   Screen PrimaryScreen Bounds Height                            else                               this TopMost   false                  this Location   this restore location                  this Width   this restore width                  this Height   this restore height                                     these are the two variables you may wish to change  depending                                    on the design of your form  WindowState and FormBorderStyle                  this WindowState   FormWindowState Normal                  this FormBorderStyle   FormBorderStyle Sizable

User · Answer

FormBorderStyle   System Windows Forms FormBorderStyle None  WindowState   FormWindowState Maximized

User · Answer

Use   FormBorderStyle   FormBorderStyle None  WindowState   FormWindowState Maximized    And then your form is placed over the taskbar

User · Answer

A tested and simple solution  I ve been looking for an answer for this question in SO and some other sites  but one gave an answer was very complex to me and some others answers simply doesn t work correctly  so after a lot code testing I solved this puzzle   Note  I m using Windows 8 and my taskbar isn t on auto-hide mode   I discovered that setting the WindowState to Normal before performing any modifications will stop the error with the not covered taskbar   The code  I created this class that have two methods  the first enters in the  full screen mode  and the second leaves the  full screen mode   So you just need to create an object of this class and pass the Form you want to set full screen as an argument to the EnterFullScreenMode method or to the LeaveFullScreenMode method   class FullScreen       public void EnterFullScreenMode Form targetForm                targetForm WindowState   FormWindowState Normal          targetForm FormBorderStyle   FormBorderStyle None          targetForm WindowState   FormWindowState Maximized             public void LeaveFullScreenMode Form targetForm                targetForm FormBorderStyle   System Windows Forms FormBorderStyle Sizable          targetForm WindowState   FormWindowState Normal            Usage example      private void fullScreenToolStripMenuItem Click object sender  EventArgs e                FullScreen fullScreen   new FullScreen             if  fullScreenMode    FullScreenMode No      FullScreenMode is an enum                       fullScreen EnterFullScreenMode this               fullScreenMode   FullScreenMode Yes                    else                       fullScreen LeaveFullScreenMode this               fullScreenMode   FullScreenMode No                    I have placed this same answer on another question that I m not sure if is a duplicate or not of this one   Link to the other question  How do I make a WinForms app go Full Screen

[c#] How to display a Windows Form in full screen on top of the taskbar?

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