How to get the parent window title using child window handle

WindowUtil.cs

 [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
  static extern IntPtr GetParent(IntPtr hWnd);

[DllImport("user32", CharSet = CharSet.Auto, SetLastError = true)]
  static extern int GetWindowText(IntPtr hWnd, [Out, MarshalAs(UnmanagedType.LPTStr)] StringBuilder lpString, int nMaxCount);

 public static String GetWindowTitle(IntPtr handle) {
    IntPtr windowParent = IntPtr.Zero;

    while (handle != IntPtr.Zero) {
        windowParent = handle;
        handle = GetParent(handle);
    }
    
    int length = GetWindowTextLength(hWnd);
    StringBuilder text = new StringBuilder(length + 1);
    GetWindowText(hWnd, text, text.Capacity);
  
    return text.ToString();
}