c# - Model value is null but why? -

i've been working on web application uni handle travel bookings in c# , have have hit brick wall trying overcome issue.

when attempting open webpage 'flightdb', receive following error:

an exception of type 'system.nullreferenceexception' occurred in app_web_z0gc0uw3.dll not handled in user code 

in flightdb's view, value of model null. i'm causing error, can't understand why.

here's view:

@model ienumerable<websiteassignment.models.flightstbl>  @{     viewbag.title = "choose flights:"; }  <h2>flightdb</h2> <table>      @foreach (var item in model) //model = null     {         <tr>             <td>                 @html.displayfor(modelitem => item.flightid)             </td>             <td>                 @html.displayfor(modelitem => item.departing_airport)             </td>             <td>                 @html.displayfor(modelitem => item.arriving_airport)             </td>             <td>                 @html.displayfor(modelitem => item.departure_flight_time)             </td>             <td>                 @html.displayfor(modelitem => item.return_flight_time)             </td>             <td>                 @html.displayfor(modelitem => item.available_space)             </td>         </tr>     } </table> 

and controller:

using system; using system.collections.generic; using system.linq; using system.web; using system.web.mvc; using websiteassignment.models;  namespace websiteassignment.controllers {     public class homecontroller : controller     {         //         // get: /home/          private flightdbentities1 db = new flightdbentities1();          public actionresult index()         {             int currenthour = datetime.now.hour;             viewbag.message = currenthour < 12 ? "good morning" : "good afternoon";              return view(db.flightstbls.tolist());         }          [httpget]         public actionresult applicationpage()         {             return view();         }          [httppost]         public actionresult applicationpage(application newapplication)         {             var websiteassignment = new list<application>();              if (session["websiteassignment"] != null)             {                 websiteassignment = (list<application>)session["websiteassignment"];             }              websiteassignment.add(newapplication);              session["websiteassignment"] = websiteassignment;               if (modelstate.isvalid)             {                 return redirecttoaction("flightdb");                 //return redirecttoaction("index");             }             else             {                 return view();             }         }          public actionresult flightdb()         {             return view();         }      } } 

if please me understand extremely grateful. pulling hair out on this.

thanks in advance help.

you must pass in model model have value. example:

public actionresult flightdb() {     return view(new list<websiteassignment.models.flightstbl>()); } 

view() has number of overloads, 1 of allows pass in model. mvc framework search view matching name of method (flightdb, in case) send model rendering.