Windows Forms dialog icon without control box

Question

I'm wondering is there a way to have icon in upper left corner of my custom dialog while control box, minimize box and maximize box are disabled? I don't need to have any functionality when icon is clicked (about, close, move, etc..) . I just want it for nicer look.

Answer 1

No control box => No icon...

When ControlBox is disabled, form windowstyle WS_SYSMENU flag is (somehow in a far out manner) dropped and so it becomes impossible for Windows to show an icon. Actually I haven't found the final explanation on why (&how) the upper-right corner icons continue to exist w/o WS_SYSMENU... but found one more nice solution that fits your needs)

    private const int GWL_STYLE = -16;
    private const int WS_CLIPSIBLINGS = 1 << 26;

    [DllImport("user32.dll", CharSet = CharSet.Auto, EntryPoint = "SetWindowLong")]
    public static extern IntPtr SetWindowLongPtr32(HandleRef hWnd, int nIndex, HandleRef dwNewLong);
    [DllImport("user32.dll", CharSet = CharSet.Auto, EntryPoint = "GetWindowLong")]
    public static extern IntPtr GetWindowLong32(HandleRef hWnd, int nIndex);

    protected override void OnLoad(EventArgs e) {
        int style = (int)((long)GetWindowLong32(new HandleRef(this, this.Handle), GWL_STYLE));
        SetWindowLongPtr32(new HandleRef(this, this.Handle), GWL_STYLE, new HandleRef(null, (IntPtr)(style & ~WS_CLIPSIBLINGS)));

        base.OnLoad(e);
    }

Answer 2

you can set ControlBox property to false. Control Box , maximize, minimize buttons will not show in the dialog box.

Form1.ControlBox = false;

OR else you can set like this, if you not willing to disable whole control box. you can set ShowIcon property to true.

Form1.MaximizeBox = false;
Form1.MinimizeBox = false;
Form1.ShowIcon=true; 

Answer 3

You can always add an Image control in the upper left corner and assign the icon to it. Would that help?