Entity Framework System.Data.Objects?

Yes , Entity Framework contains all the objects System.Data.Objects namespace.

using (NorthwindEntities context = new NorthwindEntities())

{

  MyPerson emp = context.MyPerson.FirstOrDefault(emps => emps.ssname == "name3");

}

from Designer

   public global::System.Data.Objects.ObjectQuery<MyPerson> MyPerson

        {

            get

            {

                if ((this._MyPerson == null))

                {

                    this._MyPerson = base.CreateQuery<MyPerson>("[MyPerson]");

                }

                return this._MyPerson;

            }

        }

like

at code-behind

the same thing in code

ObjectQuery<MyPerson> cs = context.CreateQuery<MyPerson>("[MyPerson]");

MyPerson myperson = new MyPerson();

myperson=cs.FirstOrDefault(ems => ems.ssname == "name3");

another Demo:

ObjectContext

Provides facilities for querying and working with entity data as objects.

public ObjectQuery<T> CreateQuery<T>(string queryString, params ObjectParameter[] parameters);

ObjectQuery

Represents a typed query against an Entity Data Model (EDM) in a given object

Context.

EX :

"SELECT VALUE emp FROM NorthwindEntities.Employees AS emp";(typed query against Entity Data Model---Object Context(EntityFrameworkDemo.NorthwindEntities)

query.Context

{EntityFrameworkDemo.NorthwindEntities}

    [EntityFrameworkDemo.NorthwindEntities]: {EntityFrameworkDemo.NorthwindEntities}

    CommandTimeout: null

    Connection: {System.Data.EntityClient.EntityConnection}

    DefaultContainerName: "NorthwindEntities"

    MetadataWorkspace: {System.Data.Metadata.Edm.MetadataWorkspace}

    ObjectStateManager: {System.Data.Objects.ObjectStateManager}

  int iers  = entitycontext.CreateQuery<Employees>(sql).Count<Employees>();

this is Explored as

NorthwindEntities entitycontext = new NorthwindEntities();

int iers  = entitycontext.CreateQuery<Employees>(sql).Count<Employees>();

or

ObjectContext Contextt = new ObjectContext(entitycontext.Connection.ConnectionString);

Contextt.Connection.Open();

var sql = "SELECT VALUE emp FROM NorthwindEntities.Employees AS emp";// [Entity-SQL]

                  // not select * from Employee-->error.

{

ObjectQuery<Employees> query = Contextt.CreateQuery<Employees>(sql);

int iers = query.Count<Employees>();

or

    int iers = Contextt.CreateQuery<Employees>(sql).Count<Employees>();

}

foreach (Employees emp in query)

Console.WriteLine("{0} {1} {2} {3}", emp.EmployeeID, emp.FirstName, emp.LastName, emp.Country);

Console.WriteLine("");

Console.Write("Cont :   " + iers);

Console.Read();

}

DEMO:

var sql = "SELECT VALUE emp FROM NorthwindEntities.Employees AS emp";

  ObjectQuery<Employees> iers;

  iers = Contextt.CreateQuery<Employees>(sql);

  iers.Name = "kasi";

============================

  ObjectQuery<Employees> i = iers.Where("kasi.Country = @country", new       ObjectParameter("country", "USA"));

Console.write(i.count<Employee>());

Or

==========================================================================

ObjectQuery<Employees> iers;  

iers = Contextt.CreateQuery<Employees>(sql);

iers.Name = "abc";

            

ObjectQuery<Employees> t= iers.Where("kasi.Country = @country", new ObjectParameter("country", "USA"));

t.Name = "def";  // Container name.

foreach (Employees emp in t)

  Console.WriteLine("{0} {1} {2} {3}", emp.EmployeeID, emp.FirstName, emp.LastName, emp.Country);

               

  Console.WriteLine("");          

  Console.Write("Cont :   " + t.Count<Employees>());

  Console.Read();

ObjectContext Executes  impliectly for every database query:

Executes the given function on the default container.

Name of function. The name may include the container name,

such as <ContainerName>.<Function Name>.

 When the default container name is known, only the

        //     function name is required.

        //

        //   parameters:

        //     An array of System.Data.Objects.ObjectParameter objects.

        //

protected ObjectResult<TElement> ExecuteFunction<TElement>(string functionName, params ObjectParameter[] parameters) where TElement