FontStyle is an enumeration you can Or them together to add or Xor to remove.

i.e.

to add underlining to existing style:

textBox1.Font = new Font(textBox1.Font, textBox1.Font.Style | FontStyle.Underline);

to remove underlining from style:

textBox1.Font = new Font(textBox1.Font, textBox1.Font.Style ^ FontStyle.Underline);

and you can check for which Enumerations are in the Font.Style by doing this.

if ((textBox1.Font.Style.HasFlag(FontStyle.Underline)))
{ textBox1.Font = new Font(textBox1.Font, textBox1.Font.Style ^ FontStyle.Underline); } else { textBox1.Font = new Font(textBox1.Font, textBox1.Font.Style | FontStyle.Underline); }

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