How to get first EntityKey Name for an Entity in EF4

Question

How can I get the 1st EntityKey name for an Entity for Entity Framework 4 because I\'m building a repository system and I wanted to get an item by Id (which is the primary key o

Answer 1

public static string GetPrimaryKeyName(this object entity)
   {
       var prop = entity.GetType().GetProperties().Where(x =>x.GetCustomAttributes(false).Where(y => y is ColumnAttribute&&((ColumnAttribute)y).IsPrimaryKey == true).Any()).FirstOrDefault();
          if (prop != null)
              return prop.Name;
          return string.Empty;

   }