Then, you will create the form if it does not already exist and show iteither way. Instead, you will move the Form variable to a module level value,and then determine if it already exists in the Click event (Listing3.20). Listing 3.19 Simple Code for Displaying a Form Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Dim myForm As New Form2 myForm.Show()End Sub

If you used the code shown inListing 3.19, a new form would open every time you click the button, which islikely not the desired result. Now, double-click the button to enter itsevent procedure for the Click event. Add a button to Form1, leaving it with adefault name of Button1. The first step is to add code to Form1 to create and display aninstance of Form2.

Creating and Displaying an Instance of a Form Accept thedefault name of Form2 for the new form and click the Open button tofinish the wizard. Add a second form by right-clicking the projectand selecting Add, Add Windows Form from the menu that appears. A form will be created with adefault name of Form1. NET, and thenpick a Visual Basic Windows Application to create. Select File, New, Project from the main menu in Visual Studio. To get things started, create the new project and add a new form. Toillustrate communication from one form to another, Form2 will also havea button, and it will change the caption of Form1 whenever it isclicked. Form1, which will be shown automatically when the project runs, willcreate and display an instance of Form2 when you click a button. I will create a new Windows application that contains two forms. I will start with a very simple example to illustratethe concept. Theresult of this change is that you need a reference to a particular instance of aform to be able to use it. This is not a majortechnical problem programmers (including VB6 programmers) have been workingwithout default instances of non-form classes for a very long time, but it is abig change if you are used to building Windows applications using VB6.

NETthe removal of default form instances. The previous section described a major change in the forms model from VB6 toVB. Learn More Buy Working with Multiple Forms in VB. Visual Basic 2015 in 24 Hours, Sams Teach Yourself

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