c# - Exception in Automapper Mapping and how to frame the class structure properly -

i facing below issues when try achieve requirement.

1. in controller have used automapper map "viewmodel" class "entities" class getting exception.i used automapper exception class catch exception, result :

   missing type map configuration or unsupported mapping

   mapping types:

   empdetails -> staffmember org.entities.empdetails -> org.web.models.staffmember

   destination path: list`1[0]

   source value: org.entities.empdetails

2. in data access layer when adding value dropdown getting exception , please advise me whether classes formed/designed , me out rid of these issues.

pfb screen shots , codes:

exception screenshots

exception automapper in controller:

exception dropdown in dal:

code:

controller:-

employeestatus ostatusbl = new employeestatus(); // business layer class public actionresult index() {     empstatusdetails ostaff = ostatusbl.getempstatusdetails();     staffmemberlist olsit = new staffmemberlist();     mapper.createmap<empstatusdetails, staffmemberlist>();     mapper.map<empstatusdetails, staffmemberlist>(ostaff); // exception occurs here     viewbag.statedropdown = ostatusbl.getstatedropdown();     return view(olsit); } 

viewmodel:-

public class staffmember {     public string fullname { get; set; }     public string fulladdress { get; set; }     public string statusmessage { get; set; }     public datetime datecreated { get; set; }     public int userid { get; set; } }  public class staffmemberlist {     public list<staffmember> staffdetails { get; set; }     public status statusdetails { get; set; }     public users userdetails { get; set; } }  public class status {     [required(errormessage = "please select name")]     public int userid { get; set; }     [required(errormessage = "status message required")]     [regularexpression(@"^[\w\d]+$", errormessage = "avoid special characters")]     [stringlength(250, errormessage = "exceeds 250 character")]     public string statusmessage { get; set; }     public datetime datecreated { get; set; }     public ienumerable<selectlistitem> dropdownnamelist { get; set; } }  public class users {      public int userid { get; set; }      [required(errormessage = "first name required")]     public string firstname { get; set; }      [required(errormessage = "last name required")]     public string lastname { get; set; }      [required(errormessage = "address required")]     [regularexpression("^[a-za-z0-9\\s,'-]*$", errormessage = "invalid address")]     [stringlength(250, errormessage = "exceeds 250 character")]     public string address { get; set; }      [required(errormessage = "city required")]     [regularexpression("^[a-za-z]+$", errormessage = "invalid city")]     [stringlength(150, errormessage = "exceeds 150 character")]     public string city { get; set; }      [required(errormessage = "state required")]     [regularexpression("^[a-za-z]+$", errormessage = "invalid state")]     public string state { get; set; }      [required(errormessage = "zip required")]     [regularexpression("^[0-9]{5}$", errormessage = "invalid zipcode")]     public int? zip { get; set; }     public datetime datecreated { get; set; } } 

entitieslayer:-

public class empdetails {     public string fullname { get; set; }     public string fulladdress { get; set; }     public string statusmessage { get; set; }     public datetime datecreated { get; set; }     public int userid { get; set; }     public statusentity statusdetails { get; set; } }  public class empstatusdetails {     public list<empdetails> staffdetails { get; set; }     public statusentity statusdetails { get; set; }     public userentity userdetails { get; set; } }  public class statusentity {     public int userid { get; set; }     public string statusmessage { get; set; }     public datetime datecreated { get; set; }     public ienumerable<selectlistitem> dropdownnamelist { get; set; } }  public class userentity {     public int userid { get; set; }     public string firstname { get; set; }     public string lastname { get; set; }     public string address { get; set; }     public string city { get; set; }     public string state { get; set; }     public int? zip { get; set; }     public datetime datecreated { get; set; } } 

businesslayer:-

    staffdetailsdal odal = new staffdetailsdal();     public empstatusdetails getempstatusdetails()     {         return odal.employeestatusanddetails();     } 

dataaccesslayer:-

public empstatusdetails employeestatusanddetails() {     empstatusdetails oemp = new empstatusdetails(); // entity layer class     list<user> = dbcontext.users.select(o => o).tolist();      list<empdetails> ostafflist = (from usrs in dbcontext.users                join stats in dbcontext.statusupdates on usrs.userid equals stats.userid                 stats.statusmessage !=null                                    select new empdetails { fullname = usrs.firstname + " " + usrs.lastname, fulladdress = usrs.address + "," + usrs.state + "," + usrs.city + "," + sqlfunctions.stringconvert((double)usrs.zip), statusmessage = stats.statusmessage, datecreated = (datetime)stats.datecreated, userid = usrs.userid }                ).orderby(x => x.datecreated).tolist<empdetails>();     ienumerable<selectlistitem> olist = (from val in ostafflist                                   select new selectlistitem { text = val.fullname, value = val.userid.tostring() }).tolist();     oemp.staffdetails = ostafflist;     oemp.statusdetails.dropdownnamelist = olist;  // exception occurs here     return oemp; } 

you need create mapping collection of staffdetails