c# - Error in Json Serialization "There is already an open DataReader associated with this Command" -

json serialization command giving error. used newtonsoft.json avoid cyclic reference error on serialization.

private iqueryable<study> getstudiesdata() {     var curruser = usermanager.findbyid(user.identity.getuserid());     var curruserrole = curruser.roles.first();      iqueryable<study> studies;     if (user.isinrole("superadmin")) {         studies = db.studies; //all studies centers      }     else {         var assignedstudies = db.studies.where(s => s.assigneduserid == curruser.id);          studies = db.studies.where(s => s.user.centerid == curruser.centerid && s.roleid == curruserrole.roleid)             .concat(assignedstudies);     }      return studies; }  //ajax call function gives error public actionresult getstudies(int pagesize = 10, int pagenum = 1) {     var studies = getstudiesdata();     var studiescount = studies.count();     var studiespaged = studies.orderby(s=>s.patientid).skip(pagesize*pagenum).take(pagesize);      var result = new { totalrows = studiescount, rows = studiespaged };      //this line gives error     //there open datareader associated command must closed first.     var data = newtonsoft.json.jsonconvert.serializeobject(result, newtonsoft.json.formatting.none,     new newtonsoft.json.jsonserializersettings()     {         referenceloophandling = newtonsoft.json.referenceloophandling.ignore     });      return json(data, jsonrequestbehavior.allowget); } 

i tried result = studies, result = studiespaged, result = studiescount in var data = newtonsoft.json.jsonconvert.serializeobject(result, ...). studiespaged giving error.

i can solve using multipleactiveresultsets=true; doing second query?

update

public actionresult getstudies(int pagesize = 10, int pagenum = 1) { var studies = getstudiesdata().tolist(); //solved, created issue //other code }

now json returned looks json again serialized string.

"{\"totalrows\":5,\"rows\":[{\"assigneduser\":null, ..... }]}" 

when parsed javascript splitted array of characters.

update2

changed

//data json string after serialization return json(data, jsonrequestbehavior.allowget); //serializing json 

to

return content(data, "application/json"); 

assigning list, , querying should prevent this:

public actionresult getstudies(int pagesize = 10, int pagenum = 1) {     var studies = getstudiesdata().tolist();     var studiescount = studies.count();     var studiespaged = studies.orderby(s=>s.patientid).skip(pagesize*pagenum).take(pagesize);      var result = new { totalrows = studiescount, rows = studiespaged };      //this line gives error     //there open datareader associated command must closed first.     var data = newtonsoft.json.jsonconvert.serializeobject(result, newtonsoft.json.formatting.none,     new newtonsoft.json.jsonserializersettings()     {         referenceloophandling = newtonsoft.json.referenceloophandling.ignore     });      return json(data, jsonrequestbehavior.allowget); }