The Web Part base class contains a set of properties that you and the users of your Web Part can use to control its appearance and behavior. For example, a Web Part's Height and Width properties can be set by your code, the user, or the Web Part definition file (.dwp) you use to import a Web Part. A custom property is a property that you create when you need additional properties to enhance your Web Part's functionality.
The Web Part base class contains a set of properties that you and the users of your Web Part can use to control its appearance and behavior. For example, a Web Part's Height and Width properties can be set by your code, the user, or the Web Part definition file (.dwp) you use to import a Web Part. A custom property is a property that you create when you need additional properties to enhance your Web Part's functionality. (-Microsoft)
