How to set multiple FontStyles when instantiating a font?

In the Font constructor, you can combine multiple FontStyles using the OR operator:

Font font = new Font(this.Font, FontStyle.Bold | FontStyle.Underline);

The FontStyle enum is a Flags enum. This means that its members are all powers of two, allowing you to combine them using a binary OR.

For example, if you want bold and underline, you'd pass

FontStyle.Bold | FontStyle.Underline

The vertical bar (|) is the binary OR operator.