Lesson 1 - 1: Using and Modifying string variables

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If you haven't read Lesson 1, please go back and do so.

 

Lesson 1 - 1 will teach you how to use a string variable, and display it inside a little messagebox.

 

 

Create a new Project (Control + N) in Visual Basic .NET, as a Windows Form and press OK.

Once the project has been created, you're presented with the form. Double click the form.

 

The following text should appear:

	Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

End Sub

Above it, add the following line:

Dim NewString As String

This will create a string variable for the program to modify. Now, on the toolbar on the left hand side of the program, locate the TextBox, and create one on the form, by clicking the TextBox control, and then clicking on the form. Then, find the Button Control, and do the same thing you did to create the TextBox control.

 

Now Double Click the button, and the following code should appear:

	Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

End Sub

Inside this new code, add the following:

NewString = TextBox1.text
Messagebox.show(NewString)

 

Let's break down the code:

NewString = Textbox1.text

This will set the variable we declared "NewString" equal to whatever is inside that TextBox.

Messagebox.show(NewString)

This will create a messagebox, that will show the variable inside it.

 

So, this is how the entire code should look now:

Public Class Form1
Dim NewString As String
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
	NewString = TextBox1.Text
	MessageBox.Show(NewString)
End Sub
End Class

Press the little green arrow at the top of the window (Or you can press F5) to start testing the program.

Fill some text in the textbox, and press the button. If all worked well, a messagebox will appear showing the text inside a messagebox!

 

Homework:

Using your knowledge of variable types (Which you should have read back in Lesson 1), create a program that will display numbers from a textbox inside a message box.