A beginner’s guide for consuming a WCF service in JavaScript using ASP.NET AJAX

#pragma warning disable 1591
//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//     Runtime Version:2.0.50727.3074
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace ServiceLibrary
{
	using System.Data.Linq;
	using System.Data.Linq.Mapping;
	using System.Data;
	using System.Collections.Generic;
	using System.Reflection;
	using System.Linq;
	using System.Linq.Expressions;
	using System.Runtime.Serialization;
	using System.ComponentModel;
	using System;
	
	
	[System.Data.Linq.Mapping.DatabaseAttribute(Name="tododb")]
	public partial class DataClasses1DataContext : System.Data.Linq.DataContext
	{
		
		private static System.Data.Linq.Mapping.MappingSource mappingSource = new AttributeMappingSource();
		
    #region Extensibility Method Definitions
    partial void OnCreated();
    partial void InsertToDo(ToDo instance);
    partial void UpdateToDo(ToDo instance);
    partial void DeleteToDo(ToDo instance);
    #endregion
		
		public DataClasses1DataContext() : 
				base(global::ServiceLibrary.Properties.Settings.Default.tododbConnectionString, mappingSource)
		{
			OnCreated();
		}
		
		public DataClasses1DataContext(string connection) : 
				base(connection, mappingSource)
		{
			OnCreated();
		}
		
		public DataClasses1DataContext(System.Data.IDbConnection connection) : 
				base(connection, mappingSource)
		{
			OnCreated();
		}
		
		public DataClasses1DataContext(string connection, System.Data.Linq.Mapping.MappingSource mappingSource) : 
				base(connection, mappingSource)
		{
			OnCreated();
		}
		
		public DataClasses1DataContext(System.Data.IDbConnection connection, System.Data.Linq.Mapping.MappingSource mappingSource) : 
				base(connection, mappingSource)
		{
			OnCreated();
		}
		
		public System.Data.Linq.Table<ToDo> ToDos
		{
			get
			{
				return this.GetTable<ToDo>();
			}
		}
	}
	
	[Table(Name="dbo.ToDo")]
	[DataContract()]
	public partial class ToDo : INotifyPropertyChanging, INotifyPropertyChanged
	{
		
		private static PropertyChangingEventArgs emptyChangingEventArgs = new PropertyChangingEventArgs(String.Empty);
		
		private long _ID;
		
		private int _Status;
		
		private string _Description;
		
    #region Extensibility Method Definitions
    partial void OnLoaded();
    partial void OnValidate(System.Data.Linq.ChangeAction action);
    partial void OnCreated();
    partial void OnIDChanging(long value);
    partial void OnIDChanged();
    partial void OnStatusChanging(int value);
    partial void OnStatusChanged();
    partial void OnDescriptionChanging(string value);
    partial void OnDescriptionChanged();
    #endregion
		
		public ToDo()
		{
			this.Initialize();
		}
		
		[Column(Storage="_ID", AutoSync=AutoSync.OnInsert, DbType="BigInt NOT NULL IDENTITY", IsPrimaryKey=true, IsDbGenerated=true)]
		[DataMember(Order=1)]
		public long ID
		{
			get
			{
				return this._ID;
			}
			set
			{
				if ((this._ID != value))
				{
					this.OnIDChanging(value);
					this.SendPropertyChanging();
					this._ID = value;
					this.SendPropertyChanged("ID");
					this.OnIDChanged();
				}
			}
		}
		
		[Column(Storage="_Status", DbType="Int NOT NULL")]
		[DataMember(Order=2)]
		public int Status
		{
			get
			{
				return this._Status;
			}
			set
			{
				if ((this._Status != value))
				{
					this.OnStatusChanging(value);
					this.SendPropertyChanging();
					this._Status = value;
					this.SendPropertyChanged("Status");
					this.OnStatusChanged();
				}
			}
		}
		
		[Column(Storage="_Description", DbType="NVarChar(50) NOT NULL", CanBeNull=false)]
		[DataMember(Order=3)]
		public string Description
		{
			get
			{
				return this._Description;
			}
			set
			{
				if ((this._Description != value))
				{
					this.OnDescriptionChanging(value);
					this.SendPropertyChanging();
					this._Description = value;
					this.SendPropertyChanged("Description");
					this.OnDescriptionChanged();
				}
			}
		}
		
		public event PropertyChangingEventHandler PropertyChanging;
		
		public event PropertyChangedEventHandler PropertyChanged;
		
		protected virtual void SendPropertyChanging()
		{
			if ((this.PropertyChanging != null))
			{
				this.PropertyChanging(this, emptyChangingEventArgs);
			}
		}
		
		protected virtual void SendPropertyChanged(String propertyName)
		{
			if ((this.PropertyChanged != null))
			{
				this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
			}
		}
		
		private void Initialize()
		{
			OnCreated();
		}
		
		[OnDeserializing()]
		[System.ComponentModel.EditorBrowsableAttribute(EditorBrowsableState.Never)]
		public void OnDeserializing(StreamingContext context)
		{
			this.Initialize();
		}
	}
}
#pragma warning restore 1591