How do I make a WinForms app go Full Screen

Question

I have a WinForms app that I am trying to make full screen (somewhat like what VS does in full screen mode).

Currently I am setting FormBorderStyle to <

Answer 1

You can use the following code to fit your system screen and task bar is visible.

    private void Form1_Load(object sender, EventArgs e)
    {   
        // hide max,min and close button at top right of Window
        this.FormBorderStyle = FormBorderStyle.None;
        // fill the screen
        this.Bounds = Screen.PrimaryScreen.Bounds;
    }

No need to use:

    this.TopMost = true;

That line interferes with alt+tab to switch to other application. ("TopMost" means the window stays on top of other windows, unless they are also marked "TopMost".)

Answer 2

You need to set your window to be topmost.

Answer 3

I recently made an Mediaplayer application and I used API-calls to make sure the taskbar was hidden when the program was running fullscreen and then restored the taskbar when the program was not in fullscreen or not had focus or was exited.

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Integer
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Integer, ByVal hWnd2 As Integer, ByVal lpsz1 As String, ByVal lpsz2 As String) As Integer
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Integer, ByVal nCmdShow As Integer) As Integer

Sub HideTrayBar()
    Try


        Dim tWnd As Integer = 0
        Dim bWnd As Integer = 0
        tWnd = FindWindow("Shell_TrayWnd", vbNullString)
        bWnd = FindWindowEx(tWnd, bWnd, "BUTTON", vbNullString)
        ShowWindow(tWnd, 0)
        ShowWindow(bWnd, 0)
    Catch ex As Exception
        'Error hiding the taskbar, do what you want here..
    End Try
End Sub
Sub ShowTraybar()
    Try
        Dim tWnd As Integer = 0
        Dim bWnd As Integer = 0
        tWnd = FindWindow("Shell_TrayWnd", vbNullString)
        bWnd = FindWindowEx(tWnd, bWnd, "BUTTON", vbNullString)
        ShowWindow(bWnd, 1)
        ShowWindow(tWnd, 1)
    Catch ex As Exception
    'Error showing the taskbar, do what you want here..     
               End Try


End Sub