c# - Printing list of diverse objects -

i trying return combine list of 2 different list types. child class derived same base class doesn't have code. can see items in base class. but, supposed have.

class baseclass {    //empty no code } class childclassa : baseclass {       public string name {get; set;}      public datetime dateaccess {get; set;}       public childclassa(string name, datetime dateaccess){         name = name;          dateaccess = dateaccess;      }        public list<childclassa> getlistmethod()      {        //block of code         return list<childclassa>;  // each items have name , dateaccess      }  }  class childclassb: baseclass {       public string group {get; set;}      public datetime sessionduration {get; set;}      public string report{get; set;}       public childclassb(string group, datetime sessionduration, string report)      {         group = group;          sessionduration = sessionduration;         report = report;       }      public list<childclassb> getlistmethod()    {      //block of code      return list<childclassb>;   // each item has group, sessionduration , report    } }  class combinelistclass {     public list<baseclass> getcombinelist()     {          list<baseclass> listfrombaseclass = new list<baseclass>();          childclassa = new childclassa();          var listfroma = a.getlistmethod();          childclassb b = new childclassb();          var listfromb = b.getlistmethod();          listfrombaseclass.addrange(listfroma);         listfrombaseclass.addrange(listfromb);          foreach(var item in listfrombaseclass)         {             //print item each listfrombaseclass            // needs print name, dateaccess, group, sessionduration, report in 1 output file.          }     } } 

you should check object type using "is" keyword , cast , display respectively proper values:

 foreach(var item in listfrombaseclass)     {         //print item each listfrombaseclass        // needs print name, dateaccess, group, sessionduration, report in 1 output file.         if (item childclassa)         {               console.writeline(((childclassa)item).name);         }         else if (item childclassb)         {               console.writeline(((childclassb)item).group);         }     }