Soup to Nuts Lab 1: A Tour of Visual Studio.Net - Exercise 3: Write Some Code

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Scenario

In this exercise, you will write a simple button-click event handler for the Get Customer button on the Customers form. You will declare some variables, concatenate strings and write code to display a message box.

        Tasks              Detailed Steps

1. Create a button-click event.
   
   Note: C# is a case-sensitive language. If using C#, Ensure that the code you type matches the code in to the right exactly.
   
   
   1. Return to the Customers.xx [Design] tab. 
      
   2. In the forms designer, Double-click the button with the text Get Customer.
      
      The code pane opens and you see an event handler stub, ready for you to write some code into. 
      
   3. Write some code into the button click event handler to declare a string variable named Value, display a message in a message box, concatenate a value and assign it to the variable, then display the variable’s value in a message box:
      
      C#
      
        private void button1_Click(object sender,
           EventArgs e)
        {
           string Value = textBox1.Text; 
           MessageBox.Show("Hello, Soup to Nuts!");
           Value = "You typed " + Value;
           MessageBox.Show(Value);
        }
      
      Visual Basic .NET
      
        Private Sub Button1_Click(ByVal sender As Object, _  
           ByVal e As EventArgs) Handles Button1.Click
           Dim Value As string = TextBox1.Text 
           MessageBox.Show("Hello, Soup to Nuts!")
           Value = "You typed " & Value
           MessageBox.Show(Value)End Sub
      
      
2. Create an application entry point.
   
   
   1. In the Solution Explorer, right-click Northwind, choose Add | Add Class.
      
      The Add New Item dialog displays with Class selected by default.
      
      
   2. In the Name box, clear the default text and type MainClass. 
      
   3. Click Open.
      
      The code pane opens for the new class in the center pane of the IDE.
       
   4. Add a Main sub routine MainClass class. The class should look like the following:
      
      C#
      using System;
      namespace Northwind
      {
        /// <summary>
        /// Summary description for MainClass.
        /// </summary>
        public class MainClass
        {
          public MainClass() 
          {
            //
            // TODO: Add constructor logic here
            //
        }
        public static void Main(string[] args)    
        {
          System.Windows.Forms. Application.Run(
            new Customers());
        }
      }
      
      Visual Basic .NET
      Public Class MainClass 
        Public Shared Sub Main(ByVal args as string())  
          System.Windows.Forms. Application.Run( _
            New Customers())
        End Sub
      End Class
      
      
3. Change the application entry point to be the one you just created.
   
   
   1. Delete the default Form1.
      
      C#
      
      In Solution Explorer, right-click Form1.cs and choose Delete, then click OK.
      
      Visual Basic.NET
      
      In Solution Explorer, right-click Form1.vb and choose Delete, then click OK.
      
      Visual Basic.NET Only
      
   2. In Solution Explorer right-click the Northwind project node and choose Properties.
      
   3. Change the Startup object in the Northwind Property Pages dialog, under Common Properties->General, in the Startup object: dropdown, choose Sub Main. 
      
   4. Click OK.

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Next: Exercise 4: Basic Debugging >>
 

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