When creating web parts it is often useful to allow users to supply some additional parameters to the web part. This can be done by adding custom attributes which can then be set by the user and used in your code.

To do this use the following syntax:

   [Personalizable(PersonalizationScope.User),
         WebBrowsable, WebDisplayName("Products List"),
         WebDescription("Use this property to change list used to retrive products from")]
        public string ProductList
        {
            get { return strProductsList; }
            set { strProductsList = value; }
        }

In this case, rather than hard coding the name of the products list, the user is able to specify which list to use.