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    <p>To disable close button you should add the following code to your Window class (the code was taken from <a href="http://blogs.microsoft.co.il/blogs/tamir/archive/2007/09/26/never-ever-close-me-how-to-disable-close-button-in-wpf.aspx" rel="noreferrer">here</a>, edited and reformatted a bit):</p> <pre><code>protected override void OnSourceInitialized(EventArgs e) { base.OnSourceInitialized(e); HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource; if (hwndSource != null) { hwndSource.AddHook(HwndSourceHook); } } private bool allowClosing = false; [DllImport("user32.dll")] private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert); [DllImport("user32.dll")] private static extern bool EnableMenuItem(IntPtr hMenu, uint uIDEnableItem, uint uEnable); private const uint MF_BYCOMMAND = 0x00000000; private const uint MF_GRAYED = 0x00000001; private const uint SC_CLOSE = 0xF060; private const int WM_SHOWWINDOW = 0x00000018; private const int WM_CLOSE = 0x10; private IntPtr HwndSourceHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { switch (msg) { case WM_SHOWWINDOW: { IntPtr hMenu = GetSystemMenu(hwnd, false); if (hMenu != IntPtr.Zero) { EnableMenuItem(hMenu, SC_CLOSE, MF_BYCOMMAND | MF_GRAYED); } } break; case WM_CLOSE: if (!allowClosing) { handled = true; } break; } return IntPtr.Zero; } </code></pre> <p>This code also disables close item in System menu and disallows closing the dialog using Alt+F4.</p> <p>You will probably want to close the window programmatically. Just calling <code>Close()</code> will not work. Do something like this:</p> <pre><code>allowClosing = true; Close(); </code></pre>
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    1. POHow to hide close button in WPF window?
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    1. USViachaslau Tysianchuk
    1. USViachaslau Tysianchuk
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    1. COIn Windows 7: The above also disables (but does not remove) the Close item in the drop-down System menu. The Close button itself is disable (looks gray), but not removed. This trick does not work for the Minimize/Maximize item/button -- I suspect WPF re-enables them.
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    2. CODisabling the button is better than just removing them, it keeps a consistent feel while letting the user know that an important operation is running.
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      1. USRobert Baker
 

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