c# - Getting Access Denied issue while using wmi process to restart a process -

i trying restart service remotely finding process id through wmi commands. able process , restart service when use individual id. when use generic id, getting access denied exception. generic id having permanent admin access server. attaching code piece. getting exception @ starting line of foreach.

public bool process(string processname, string servername, string serveruserid, string serveridpassword,mdmjobmanager mdmjobmanagerobj,string _logfile) {     var processname = "java.exe";     // var processtest = "xxxxxx";     var processtest = processname;     var connectoptions = new connectionoptions();     connectoptions.username = @"nu\" + serveruserid;     connectoptions.password = serveridpassword;     string ipaddress = getipaddress(servername);      bool status = false;      mdmjobmanagerobj.writetologfile("trying connect server :" + servername, _logfile);     managementscope scope = new managementscope(@"\\" + ipaddress + @"\root\cimv2", connectoptions);      string querystring = "select name, processid, caption, executablepath,commandline" +         "  win32_process name='" + processname + "'";      // wmi query     // var query = new selectquery("select * win32_process name ='" + processname + "'");     var query = new selectquery(querystring);     // using (var searcher = new managementobjectsearcher(scope, query))     using (var searcher = new managementobjectsearcher(scope, query))     {         foreach (managementobject process in searcher.get()) // fixed line         {             string command = process["commandline"].tostring();             if (command.contains(processtest))             {                 mdmjobmanagerobj.writetologfile("the runtime service has been identified in process list " , _logfile);                  // use processid kill process taskkill                 objectgetoptions processobjgetopt = new objectgetoptions();                 managementpath processpath = new managementpath("win32_process");                 managementclass processclass = new managementclass(scope, processpath, processobjgetopt);                 managementbaseobject processinparams = processclass.getmethodparameters("create");                 processinparams["commandline"] = string.format("cmd /c \"taskkill /f /pid {0}\"", process["processid"].tostring());                 managementbaseobject outparams = processclass.invokemethod("create", processinparams, null);                  int returncode = system.convert.toint32(outparams["returnvalue"]);                  switch (returncode)                 {                     case 0: mdmjobmanagerobj.writetologfile("the restart successfull ", _logfile);                         status = true;                         break;                     case 2: mdmjobmanagerobj.writetologfile("the restart failed reason : access denied", _logfile);                         throw new exception("access denied");                     case 3: mdmjobmanagerobj.writetologfile("the restart failed reason :insufficient privilege ", _logfile);                         throw new exception("insufficient privilege");                     case 8: mdmjobmanagerobj.writetologfile("the restart failed reason : unknown failure ", _logfile);                         throw new exception("unknown failure");                     case 9: mdmjobmanagerobj.writetologfile("the restart failed reason : path not found", _logfile);                         throw new exception("path not found");                     case 21: mdmjobmanagerobj.writetologfile("the restart failed reason : invalid parameter", _logfile);                         throw new exception("invalid parameter");                     default: mdmjobmanagerobj.writetologfile("the restart failed reason : terminate failed error code" + returncode.tostring(), _logfile);                         throw new exception("terminate failed error code " + returncode.tostring());                 }