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Step 10: Write Code for Additional Buttons and a Check Box

Now you're ready to complete the other four methods. You could copy and paste this code, but if you want to learn the most from this tutorial, type the code and use IntelliSense.

link to videoFor a video version of this topic, see Tutorial 1: Create a Picture Viewer in Visual Basic - Video 5 or Tutorial 1: Create a Picture Viewer in C# - Video 5.

NoteNote

As a best practice: Always comment your code. Comments are information for a person to read, and it's worth the time to make your code understandable. Everything on a comment line is ignored by the program. In Visual C#, you comment a line by typing two forward slashes at the beginning (//), and in Visual Basic you comment a line by starting with a single quotation mark (').

To write code for additional buttons and a check box

  • Add the following code.

    
    Private Sub clearButton_Click() Handles clearButton.Click
        ' Clear the picture.
        PictureBox1.Image = Nothing
    End Sub
    
    Private Sub backgroundButton_Click() Handles backgroundButton.Click
        ' Show the color dialog box. If the user clicks OK, change the
        ' PictureBox control's background to the color the user chose.
        If ColorDialog1.ShowDialog() = DialogResult.OK Then
            PictureBox1.BackColor = ColorDialog1.Color
        End If
    End Sub
    
    Private Sub closeButton_Click() Handles closeButton.Click
        ' Close the form.
        Close()
    End Sub
    
    Private Sub CheckBox1_CheckedChanged() Handles CheckBox1.CheckedChanged
        ' If the user selects the Stretch check box, change 
        ' the PictureBox's SizeMode property to "Stretch". If the user 
        ' clears the check box, change it to "Normal".
        If CheckBox1.Checked Then
            PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
        Else
            PictureBox1.SizeMode = PictureBoxSizeMode.Normal
        End If
    End Sub
    
    
    

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