<?xml version="1.0" encoding="utf-8" ?>
<commands>
 <command
  name="showhiddenlists"
  class="DVP.StsAdmExtensions.DvpOperation, DVP.StsAdmExtensions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=391fd2089473022a"/>	
</commands>

string ISPStsadmCommand.GetHelpMessage(string command)
{
    return "usage : stsadm -o showhiddenlists -url <votre url>";
}
int ISPStsadmCommand.Run(string command, System.Collections.Specialized.StringDictionary keyValues, out string output)
{
    StringBuilder CommandOutput = new StringBuilder();
    output = string.Empty;
    if (!keyValues.ContainsKey("url"))
        return -2;
    try
    {
        using (SPSite Site = new SPSite(keyValues["url"]))
        {
            using (SPWeb Web = Site.OpenWeb())
            {
                SPListCollection Lists = Web.Lists;
                foreach (SPList List in Lists)
                {
                    if (List.Hidden)
                        CommandOutput.AppendFormat(
                            "List : {0}\r\nGuid : {1}\r\n Items : {2}\r\n\r\n-------------------------------------\r\n",
                            List.Title,
                            List.ID.ToString(),
                            List.ItemCount.ToString());

                }
            }
        }
        output = CommandOutput.ToString();
    }
    catch (Exception Ex)
    {
        output = Ex.Message;
        return -2;
    }

    return 0;
}

System.Diagnostics.Debugger.Launch();