c# - Creating Drop down List for Create Action -

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i have problem creating drop down list in view create action. view show field student number, title , description , nothing program , category drop-down list. not sure how create selectlist , pass view. don't know if did right.

    public class serviceform     {         [required]         [display(name="student number")]         public int student_number { get; set; }         [required]         [display(name="program")]         public selectlist program { get; set; }         [required]         [display(name = "title")]         public string title { get; set; }         [required]         [display(name = "description")]         public string description { get; set; }         [required]         [display(name = "category")]         public selectlist category { get; set; }      }     public class program     {         public int id { get; set; }         public string program_code { get; set; }         public string program_desc { get; set; }     }      public ienumerable<programlist> getallprograms()     {         var s = ds.programs.orderby(m => m.program_code);         return automapper.mapper.map<ienumerable<programlist>>(s);     }      private servicemanager m = new servicemanager();     private programmanager pm = new programmanager();        [httpget]     public actionresult create()     {          serviceform form = new serviceform();         form.program = new selectlist(pm.getallprograms(), "id", "program_code");         list<selectlistitem> cat = new list<selectlistitem>();         cat.add(new selectlistitem() { text = "general", value = "general", selected = true });         cat.add(new selectlistitem() { text = "grades", value = "grades", selected = false });         cat.add(new selectlistitem() { text = "time table", value = "timetable", selected = false });         cat.add(new selectlistitem() { text = "zenit account", value = "zenit", selected = false });         form.program = new selectlist(cat, cat.elementat(0));         return view(form);     }      [httppost]     public actionresult create(serviceadd newservice)     {         if (!modelstate.isvalid)         {             var reform = automapper.mapper.map<serviceform>(newservice);             reform.program = new selectlist(pm.getallprograms(), "id", "program_code");             list<selectlistitem> cat = new list<selectlistitem>();             cat.add(new selectlistitem() { text = "general", value = "general", selected = true });             cat.add(new selectlistitem() { text = "grades", value = "grades", selected = false });             cat.add(new selectlistitem() { text = "time table", value = "timetable", selected = false });             cat.add(new selectlistitem() { text = "zenit account", value = "zenit", selected = false });             reform.program = new selectlist(cat, cat.elementat(0));             return view(reform);         }          return redirecttoaction("create");     }

model 

 public class serviceform         {             [required]             [display(name="student number")]             public int student_number { get; set; }             [required]             [display(name="program")]             public selectlist programs { get; set; }              public string selectedprogram { get; set; }              [required]             [display(name = "title")]             public string title { get; set; }             [required]             [display(name = "description")]             public string description { get; set; }             [required]             [display(name = "category")]             public selectlist categories{ get; set; }              public string selectedcategory { get; set; }          }

controller

[httpget] public actionresult create() {      serviceform form = new serviceform();       list<selectlistitem> cat = new list<selectlistitem>();     cat.add(new selectlistitem { text = "general", value = "general", selected = true });     cat.add(new selectlistitem { text = "grades", value = "grades", selected = false });     cat.add(new selectlistitem { text = "time table", value = "timetable", selected = false });     cat.add(new selectlistitem { text = "zenit account", value = "zenit", selected = false });     form.categories = cat;       //fill programs property here...      return view(form); }

view

@model serviceform  @using(html.beginform(...)) {      @html.labelfor(m=>m.programs)      @html.dropdownfor(x => x.selectedprogram , model.programs)      @html.labelfor(m=>m.categories)      @html.dropdownfor(x => x.selectedcategory, model.categories)  }

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