Question

I am trying to get a message box to pop up in front of all windows so the user will see it. I have the following code but it seems to put the message box to the very back.

DialogResult dlgResult = MessageBox.Show(new Form() { TopMost = true }, "Do you want to continue?", "Continue?",
            MessageBoxButtons.YesNo, MessageBoxIcon.Question);
        if (dlgResult == DialogResult.Yes)
        {
            Console.WriteLine("YES");
        }
        else if (dlgResult == DialogResult.No)
        {
            Console.WriteLine("NO");
        }

The above code is run in a thread is this my problem and how would I fix this?

Thanks

Answer 1

The best option, in a situation like this, is probably to use P/Invoke to call the MessageBox function directly. You can then include the MB_TOPMOST flag, which will force this to be a topmost message box. (This is not exposed in the managed API.)

This would be declared as (from pinvoke.net):

[DllImport("coredll.dll", SetLastError=true)]
public static extern int MessageBoxW(int hWnd, String text, String caption, uint type);

Then called as:

MessageBoxW(0, "Topmost Window", "Hello world", 0x00000040L /*MB_ICONINFORMATION*/ | 0x00040000L /*MB_TOPMOST*/);