c# - Validation error: EntityType has no key defined -


when try create controller error call " entitytype has no key defined" . why that? 

using system; using system.collections.generic; using system.data.entity; using system.linq; using system.web; using system.componentmodel.dataannotations;  namespace hotelmanagementsystem.models {     public class room     {         public int roomno { get; set; }         public string packageid { get; set; }         public string resid { get; set; }         public bool tv { get; set; }         public bool wifi { get; set; }         public bool internet { get; set; }         public bool telephone { get; set; }         public bool ac { get; set; }         public bool bathroom { get; set; }         public bool fridge { get; set; }         public bool homethearter { get; set; }     }     public class roomcontext : dbcontext {     public dbset<room/*table name*/> hotelmanagementsystem /*data base name */ { get; set; } } }

erroe message :enter image description here

add property of id primary key this:

[key] public int id  {get;set;}

actually have not defined primary key in model.

if roomno unique in each row, can make primary key.


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