How to push data from WCF service to client application

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C#

Visual-Studio

WCF

I have a WCF Service Hosted on Windows Forms Application.
I have a Client Application(Windows forms application).

I want to send data from Client application to the Windows Forms Application where WCF Service is hosted.

Here is my code:
IMyService.cs

[DataContract]
   public class DataMessage
   {
       [DataMember]
       public string Name { get; set; }
   }
[ServiceContract]
    public interface IService1
    {
        [OperationContract]
        string GetMessage(string name);

        [OperationContract]
        void BroadcastToClient(DataMessage eventData);
   
    }

Client Code:

ServiceReference1.Service1Client client;
DataMessage message = new DataMessage();
message.Name = textBox1.Text;
client.BroadcastToClient(message);

What should I add in Service.cs, so that this pushes the data to the hosted Application.

What I have tried:

Service.cs:

public void BroadcastToClient(DataMessage eventData)
       {
           MessageBox.Show(eventData.Name);
       }

I have added Messagebox to just see whether its receiving the data from client Application, and its working fine...

Now I want to send it to Hosted Application.