how to create wcf service in asp.net with example

Description:
WCF is more popular now a days and for beginners, I will explain you step by step to create wcf service in asp.net c# with example following below:

• Open Visual Studio and select File => New => Project => WCF Service Application.
• Now appear IService1.cs and Service1.svc page in solution explorer.
• You can remove the default methods and class. 
• First of all create a class and its properties in IService1.cs page like below.

    [DataContract]

    public class Country

    {

        [DataMember]

        public int ID { get; set; }

        [DataMember]

        public string CountryName { get; set; }
    }

    

(Note : Here  [DataContract] attribute for class and [DataMember] attribute for properties.)

• Now create the service methods with [OperationContract] attribute within Interface like below.

    [ServiceContract]

    public interface IService1

    {

       [OperationContract]

        List<Country> GetCountry();
    }

        

(Note : Here the List is a return type, Country is a class name and GetCountry is a method name.)

• Now go to the Service1.svc page.

• Keep the cursor on inherited interface IService1 then appear down arrow option and click on it.

• Under the down arrow option, Two option appear, select "implement interface IService1" option.

• Now all methods of IService1 interface will come in Service1 page automatically like below.

    public class Service1 : IService1

    {

        public List<Country> GetCountry()

        {

            throw new NotImplementedException();

        }
    }

•     Now type your code into the above inherited method like below  and you can remove the                             throw new NotImplementedException();

        public List<Country> GetCountry()

        {

            XElement el = XElement.Load("CountryOrState.xml");

            List<Country> Coun = new List<Country>();

            Coun = (from myRow in el.Elements()

                    select new Country()

                    {

                        CountryName = myRow.Attribute("Name").Value,

                        ID = Convert.ToInt32(myRow.Attribute("ConId").Value)

                    }).Distinct().ToList();

            return Coun;

        }

• Now You can apply the service reference to your application.