public partial class MainWindow : Window
    {

        private IBindingList bl;

        public MainWindow()
        {
            InitializeComponent();
            GetPost();
        }

        private void GetPost()
        {
            using (priceEntities context = new priceEntities())
            {
                this.bl = ((from p in context.Prices select p) as IListSource).GetList() as IBindingList;

                this.grdMain.DataContext = this.bl;            
            }
        
        }
    }

namespace System.Data.Objects
{
    // Summary:
    //     Implements common functionality for queries against a conceptual model using
    //     both LINQ to Entities and System.Data.Objects.ObjectQuery<T>.
    public abstract class ObjectQuery : IOrderedQueryable, IQueryable, IEnumerable, IListSource
    {
        // Summary:
        //     Returns the command text for the query.
        //
        // Returns:
        //     A string value.
        public string CommandText { get; }
        //
        // Summary:
        //     Gets the object context associated with this object query.
        //
        // Returns:
        //     The System.Data.Objects.ObjectContext associated with this System.Data.Objects.ObjectQuery<T>
        //     instance.
        public ObjectContext Context { get; }
        //
        // Summary:
        //     Gets or sets a value that indicates whether the query plan should be cached.
        //
        // Returns:
        //     A value that indicates whether the query plan should be cached.
        public bool EnablePlanCaching { get; set; }
        //
        // Summary:
        //     Gets or sets how objects returned from a query are added to the object context.
        //
        // Returns:
        //     The query System.Data.Objects.MergeOption.
        public MergeOption MergeOption { get; set; }
        //
        // Summary:
        //     Gets the parameter collection for this object query.
        //
        // Returns:
        //     The parameter collection for this System.Data.Objects.ObjectQuery<T>.
        public ObjectParameterCollection Parameters { get; }

        // Summary:
        //     Executes the untyped object query with the specified merge option.
        //
        // Parameters:
        //   mergeOption:
        //     The System.Data.Objects.MergeOption to use when executing the query. The
        //     default is System.Data.Objects.MergeOption.AppendOnly.
        //
        // Returns:
        //     An System.Data.Objects.ObjectResult<T> that contains a collection of entity
        //     objects returned by the query.
        public ObjectResult Execute(MergeOption mergeOption);
        //
        // Summary:
        //     Returns information about the result type of the query.
        //
        // Returns:
        //     A System.Data.Metadata.Edm.TypeUsage value that contains information about
        //     the result type of the query.
        public TypeUsage GetResultType();
        //
        // Summary:
        //     Returns the commands to execute against the data source.
        //
        // Returns:
        //     A string that represents the commands that the query executes against the
        //     data source.
        [Browsable(false)]
        public string ToTraceString();
    }
}