Say you have a user control that contains some other web controls, such as a text box or drop down list.  Now say that you want the UI designer to be able to set the font properties of the contained controls, by setting the font properties of the control in the designer.  Well, if you've ever tried this:

this.myContainedControl.Font = this.Font;

You'll find that the Font property is read only.  You can set the individual properties, but this would be a pain for all of the properties that the FontInfo object supports.  Luckily, the FontInfo object has a CopyFrom method, which you can use to do accomplish this task in one fell swoop: