TaskDialog

[DllImport("Comctl32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern int TaskDialog(
   IntPtr hwndOwner,
   IntPtr hInstance,
   [MarshalAs(UnmanagedType.LPWStr)] string pszWindowTitle,
   [MarshalAs(UnmanagedType.LPWStr)] string pszMainInstruction,
   [MarshalAs(UnmanagedType.LPWStr)] string pszContent,
   int dwCommonButtons,
   IntPtr pszIcon,
   out int pnButton
);

Microsoft documentation: Link