Add project files.

WinFormDi/MainWindow.cs

@@ -0,0 +1,35 @@
+using DIDemoLib;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace WinFormDi
+{
+    public partial class MainWindow : Form
+    {
+        private readonly IMessages _messages;
+
+        public MainWindow(IMessages messages)
+        {
+            InitializeComponent();
+            _messages = messages;
+        }
+
+        private void MainWindow_Load(object sender, EventArgs e)
+        {
+            helloText.Text= _messages.SayHello();
+        }
+
+        private void MainWindow_FormClosing(object sender, FormClosingEventArgs e)
+        {
+            goodbyeText.Text= _messages.SayGoodBye();
+            MessageBox.Show("Closing...", "Warning", MessageBoxButtons.OK);
+        }
+    }
+}