Ch5 try it

Chapter 5/Chapter 5.csproj

@@ -33,6 +33,7 @@
         <WarningLevel>4</WarningLevel>
     </PropertyGroup>
     <ItemGroup>
+        <Reference Include="Microsoft.VisualBasic" />
         <Reference Include="System"/>
         <Reference Include="System.Core"/>
         <Reference Include="System.Xml.Linq"/>
@@ -54,6 +55,9 @@
         </Compile>
         <Compile Include="Program.cs"/>
         <Compile Include="Properties\AssemblyInfo.cs"/>
+        <EmbeddedResource Include="Form1.resx">
+          <DependentUpon>Form1.cs</DependentUpon>
+        </EmbeddedResource>
         <EmbeddedResource Include="Properties\Resources.resx">
             <Generator>ResXFileCodeGenerator</Generator>
             <LastGenOutput>Resources.Designer.cs</LastGenOutput>

Chapter 5/Form1.Designer.cs

@@ -29,12 +29,32 @@
         /// </summary>
         private void InitializeComponent()
         {
-            this.components = new System.ComponentModel.Container();
+            this.btnInput = new System.Windows.Forms.Button();
+            this.SuspendLayout();
+            // 
+            // btnInput
+            // 
+            this.btnInput.Location = new System.Drawing.Point(648, 380);
+            this.btnInput.Name = "btnInput";
+            this.btnInput.Size = new System.Drawing.Size(75, 23);
+            this.btnInput.TabIndex = 0;
+            this.btnInput.Text = "input";
+            this.btnInput.UseVisualStyleBackColor = true;
+            this.btnInput.Click += new System.EventHandler(this.button1_Click);
+            // 
+            // Form1
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(800, 450);
+            this.Controls.Add(this.btnInput);
+            this.Name = "Form1";
             this.Text = "Form1";
+            this.ResumeLayout(false);
         }
 
+        private System.Windows.Forms.Button btnInput;
+
         #endregion
     }
 }

Chapter 5/Form1.cs

@@ -6,15 +6,45 @@ using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.Windows.Forms;using System;
+using System.Collections.Generic;
 using System.Windows.Forms;
 
+
 namespace Chapter_5
 {
     public partial class Form1 : Form
     {
+        
         public Form1()
         {
             InitializeComponent();
         }
+        private List<string> friendNames = new List<string>();
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            string input = "";
+            do
+            {
+                input = Microsoft.VisualBasic.Interaction.InputBox(
+                    "Please enter a friend's name, then press ENTER" + Environment.NewLine + "(Enter -99 to stop input)",
+                    "Input", "John Doe", 100, 100);
+            
+                if(input != "-99")
+                {
+                    friendNames.Add(input);
+                }
+            }
+            while (input != "-99");
+
+            ShowFriendNames();
+        }
+
+        private void ShowFriendNames()
+        {
+            string names = string.Join(Environment.NewLine, friendNames);
+            MessageBox.Show("Here are your friends:" + Environment.NewLine + names, "Friends List", MessageBoxButtons.OK, MessageBoxIcon.Information);
+        }
     }
 }