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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 void clearButton_Click(object sender, EventArgs e)
    {
        // Clear the picture.
        pictureBox1.Image = null;
    }
    
    private void backgroundButton_Click(object sender, EventArgs e)
    {
        // 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)
            pictureBox1.BackColor = colorDialog1.Color;
    }
    
    private void closeButton_Click(object sender, EventArgs e)
    {
        // Close the form.
        this.Close();
    }
    
    private void checkBox1_CheckedChanged(object sender, EventArgs e)
    {
        // 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)
            pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
        else
            pictureBox1.SizeMode = PictureBoxSizeMode.Normal;
    }
    
    
    

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