Form1.cs

//The MIT License (MIT)

//Copyright (c) 2017 Jordi Corbilla

//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in
//all copies or substantial portions of the Software.

//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//THE SOFTWARE.

using System;
using System.Windows.Forms;
using Microsoft.AspNet.SignalR.Client;
using System.Globalization;

namespace NotificationSender
{
    public partial class Form1 : Form
    {
        HubConnection hubConnection;
        IHubProxy hubProxy;

        public Form1()
        {
            InitializeComponent();
            hubConnection = new HubConnection("http://localhost/ClientSite/signalr/hubs/");
            hubProxy = hubConnection.CreateHubProxy("NotificationHub");
            hubProxy.On<string>("newNotificationReceived", (message) => listBox1.BeginInvoke((MethodInvoker)delegate () { listBox1.Items.Add(string.Format("{0} Message sent: {1}", DateTime.Now.ToString("G", CultureInfo.CurrentCulture), message)); }));
            hubConnection.Start().Wait();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            hubProxy.Invoke("BroadcastMessageToClients", textBox1.Text, "User1").Wait();
            textBox1.Text = "";
        }
    }
}