What is the correct syntax to designate a default button?

The correct answer is: B. Form.defaultButton=button1

The default button is the button that is automatically selected when the user presses Enter. To designate a default button, you use the Form.defaultButton property. The value of this property is a reference to the button that you want to be the default button.

The other options are incorrect because:

• Form.default is not a valid property.
• Form.AcceptButton is a valid property, but it is used to designate the button that is clicked when the user presses the Enter key to accept a dialog box.
• Form.focused is a valid property, but it is used to designate the button that is currently in focus.

Here is an example of how to designate a default button:

“`
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();

    // Designate button1 as the default button.
    this.defaultButton = button1;
}

}
“`

In this example, the button1 button is designated as the default button. When the user presses Enter, the button1 button will be automatically selected.