asp.net mvc - Understanding how strongly typed html helper works -

framework: asp.net mvc 3
tools: vs 2012

hi guys, i'm new asp.net mvc, have been using typed html helper time,i don't understand them know can provide type checking , keeps name according property name,after using many times faced error , dont seem have hint why occuring tried several google searches none helped me.

error: name 'm' not exist in current context
code: @html.labelfor(m => m.orginalcont.title)

but line of code works fine. @html.textbox("origtitle", model.orginalcont.title, new { @readonly = "", @class = "text-rounded", style = "width:425px" })

can tell me whats going on here.i have used same m => m.name syntax several times in view working fine.

update: alright try post more code,but code may long try keep short , post code related problem.

view

@model ts.mop.interface.models.projecttranslationmodel     <div class="form-item">     @html.labelfor(model => model.orginalcont.title)     <div class="editor-field">         @html.textbox("origtitle", model.orginalcont.title, new { @readonly = "", @class = "text-rounded", style = "width:425px" })     </div> </div> 

model

public class projecttranslationmodel {  public int projectid { get; set; }  [required(errormessageresourcetype = typeof(names), errormessageresourcename = "required_errormessage")]  [datatype(datatype.text)]  [display(resourcetype = typeof(names), description = "translatelangs_description", name = "translatelangs_title")]  public list<selectlistitem> translatablelangselect { get; set; }  public translatablelanguageeditor translatablelangeditor { get; set; }  public originalcontent orginalcont { get; set; } } 

controller

[authorize]     public actionresult translationedit(int? id)     {         if (id.hasvalue && user.isinrole("contenttranslator"))         {             var model = new projecttranslationmodel();             model.projectid = id.value;             var contenttypeid = 2;//project page             guid _currentuserid = guid.parse(membership.getuser(user.identity.name).provideruserkey.tostring());             var translatorsettings = db.translatorsettings.where(x => x.userid == _currentuserid).tolist();             model.translatablelangeditor = new translatablelanguageeditor();             var list = new list<selectlistitem>();              //original text             var originalcontent = db.projects.where(x => x.id == id.value)                 .select(d => new originalcontent { title = d.title, content = d.description, contentcultureid = d.projecttype.contentcultureid }).firstordefault();             model.orginalcont = originalcontent;              foreach (var item in translatorsettings)             {                 //select list                                                var li = new selectlistitem();                 if (item.contentcultureid != originalcontent.contentcultureid)//dont add original content cultureid dropdown                 {                     li.value = item.contentcultureid.tostring();                     li.text = item.contentculture.description;                     list.add(li);                 }             }             model.translatablelangselect = list;             return view(model);         }         else         {             return view("index");         }     }