how to get userdetails from Active Directory based on username using asp.net

Introduction:

Here I will explain how to get userdetails from Active directory based on username using asp.net

Description:

One day I got requirement like to get user details from Active directory based on username.

For that first create one new website after that right click on website and select Add Reference option after that select System.DirectoryServices from .NET tab and click ok now directory services reference has added to our application do you know why we have added this directory service to our application because by using this service we can get userdetails from Active directory.