“Specified method is not supported.” in entity framework

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C#

.NET

entity-framework

this is my entity class listed as

public partial class NerdDinnerEntities : ObjectContext
   {
       #region Constructors


       public NerdDinnerEntities(string connectionString)
           : base(connectionString, "NerdDinnerEntities")
       {
           try
           {
               ObjectContext oc = new ObjectContext(connectionString);

              oc.Connection.ChangeDatabase("NERDDINNER1");
              oc.AcceptAllChanges();
               this.ContextOptions.LazyLoadingEnabled = true;
               OnContextCreated();
           }
           catch (Exception ex) { }
       }


       #endregion

       #region Partial Methods

       partial void OnContextCreated();

       #endregion

       #region ObjectSet Properties

       ///
       /// No Metadata Documentation available.
       ///
       public ObjectSet Dinners
       {
           get
           {
               if ((_Dinners == null))
               {
                   _Dinners = base.CreateObjectSet("Dinners");
               }
               return _Dinners;
           }
       }
       private ObjectSet _Dinners;

       ///
       /// No Metadata Documentation available.
       ///
       public ObjectSet RSVPs
       {
           get
           {
               if ((_RSVPs == null))
               {
                   _RSVPs = base.CreateObjectSet("RSVPs");
               }
               return _RSVPs;
           }
       }
       private ObjectSet _RSVPs;

       ///
       /// No Metadata Documentation available.
       ///
       public ObjectSet sysdiagrams
       {
           get
           {
               if ((_sysdiagrams == null))
               {
                   _sysdiagrams = base.CreateObjectSet("sysdiagrams");
               }
               return _sysdiagrams;
           }
       }
       private ObjectSet _sysdiagrams;

       #endregion
       #region AddTo Methods

       ///
       /// Deprecated Method for adding a new object to the Dinners EntitySet. Consider using the .Add method of the associated ObjectSet<T> property instead.
       ///
       public void AddToDinners(Dinner dinner)
       {
           base.AddObject("Dinners", dinner);
       }

       ///
       /// Deprecated Method for adding a new object to the RSVPs EntitySet. Consider using the .Add method of the associated ObjectSet<T> property instead.
       ///
       public void AddToRSVPs(RSVP rSVP)
       {
           base.AddObject("RSVPs", rSVP);
       }

       ///
       /// Deprecated Method for adding a new object to the sysdiagrams EntitySet. Consider using the .Add method of the associated ObjectSet<T> property instead.
       ///
       public void AddTosysdiagrams(sysdiagram sysdiagram)
       {
           base.AddObject("sysdiagrams", sysdiagram);
       }

       #endregion
   }

and these is my web.config file as

<add name="NerdDinnerEntities" connectionString="metadata=res://*/Models.NerdDinner.csdl|res://*/Models.NerdDinner.ssdl|res://*/Models.NerdDinner.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=@;Database=NERDDINNER;User ID=@;Password=@@@;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClients" />

and i am getting error in this line as

oc.Connection.ChangeDatabase("NERDDINNER1");

Specified method is not supported.

i do not know how to proceed can u give ur valuable sugessions