How to get the current user's Active Directory details in C#

Question

I am working on an C# and ASP.Net application, that uses Windows Authentication.

i.e. in Web.config:

Answer 1

The "pre Windows 2000" name i.e. DOMAIN\SomeBody, the Somebody portion is known as sAMAccountName.

So try:

using(DirectoryEntry de = new DirectoryEntry("LDAP://MyDomainController"))
{
   using(DirectorySearcher adSearch = new DirectorySearcher(de))
   {
     adSearch.Filter = "(sAMAccountName=someuser)";
     SearchResult adSearchResult = adSearch.FindOne();
   }
}

someuser@somedomain.com.au is the UserPrincipalName, but it isn't a required field.