The font object from the Control.Font property keeps a link to the control
it comes from, so that modifying this font object modifies the font used for drawing the control.
Example
' Set the font used by MyTextBox for displaying its text
MyTextBox.Font.Name = "Utopia"
' Set the font used by MyTextBox for displaying its text from a string containing the font values
MyTextBox.Font = Font["Arial, 12, bold"]