TaskDialogIndirect

[DllImport("Comctl32.dll", SetLastError = true)]
public static extern int TaskDialogIndirect(
   [In] ref TASKDIALOGCONFIG pTaskConfig,
   out int pnButton,
   out int pnRadioButton,
   [MarshalAs(UnmanagedType.Bool)] out bool pfVerificationFlagChecked
);

Microsoft documentation: Link