Create wcf service to call by jquery ajax json

In this post we will see how to create wcf service in C# that we can call through jquery ajax and json. The namespaces we need in wcf service are System.ServiceModel, System.ServiceModel.Web and System.ServiceModel.Activation.

Example- WCF service to call by jquery ajax json

using System.ServiceModel;
using System.ServiceModel.Web;
using System.ServiceModel.Activation;
using System.Web;

namespace aspnetcontrol
{
  [ServiceContract(Namespace = "")]
  [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
  public class Service1 
  {
    [WebGet()]
    [OperationContract]
    public string GetMessage(string message)
    {
      return "WCF" + message;
    }
  }
}

Note: In above code important attributes are [ServiceContract(Namespace = "")], [OperationContract] and [WebGet()]. ServiceContract specifies that class defines service contract in application.
OperationContract specifies that a method defines and operation that is part of web service contract.
WebGet indicates service operation is logically a retrieval operation. In this way we can create wcf service to be called using jquery ajax json. In order to make service accessible we need to configure wcf service in web.config.