While shopping online, we can choose a product, e.g. books, software and place order with some company. To ship our order the company requests our billing and shipping address. If we intend to gift that product to anyone, then both addresses will be different. But sometimes the may be the same. For same billing and shipping address shopping cart makes us to select.

By clicking (checking/selecting) it our billing address content get fill in shipping address field which save our time to retype same address again. The process of auto filling data is proceeded by JavaScript. So, you are able to design JavaScript Auto filling data for ASP.NET web forms, as well as to lock those fields as we simply coping data from one data field to other.

Working and coding of any JavaScript which get applied on web forms is based on design of form. So first of all we design a web form in ASP.NET. You can design form depending upon data you want from user.

Create new ASP.NET web site and design your form.