How to get sAMAccountName from Active Directory

using System.DirectoryServices; private string GetsAMAccountName() {      string domuser = PContext.Current.Web.CurrentUser.LoginName.Trim();     domuser = domuser.Substring(domuser.IndexOf(@"\")+ 1);     string ret = "";     //init ldap call     DirectoryEntry dentry = new DirectoryEntry("LDAP://server");     //search ldap     DirectorySearcher dsearcher = new DirectorySearcher(dentry);     dsearcher.PageSize = 1000;     dsearcher.Filter = ("(&(|(objectClass=person)(objectClass=user))(sAMAccountName=" + domuser + "))");      // find users      foreach (System.DirectoryServices.SearchResult sres in dsearcher.FindAll())      {                 DirectoryEntry de = sres.GetDirectoryEntry();                  if(de.Properties["employeeID"]  != null && de.Properties["employeeID"].Value != null)           {             string employee =  de.Properties["employeeID"].Value.ToString().Trim();                          System.DirectoryServices.PropertyCollection props = de.Properties;                          ret += props["sAMAccountName"][0];                    }       }       return ret; }