Searcher.Filter users from Active Directory

Some different types of Searcher. Filter which filters the users from Active Directory according to the search query

//Search all the users from Active Directory

searcher.Filter = "(&(objectCategory=Person)(objectClass=User))";

//Search specific user from Active Directory

searcher.Filter = "(&(objectCategory=Person)(sAMAccountName=userloginname))";

//Get today’s Date

string modifieddatestring = SPUtility.CreateISO8601DateTimeFromSystemDateTime(DateTime.UtcNow);

modifieddatestring = modifieddatestring.ToString().Remove(10);

string sDate = modifieddatestring.ToString().Replace("-", "") + "000000.0Z";

//Search only the users which are created in Active Directory on the same day

searcher.Filter = "(&(objectCategory=Person)(objectClass=User)(whenCreated>=" + sDate + "))";

//Search only the users which are updated in Active Directory on the same day

searcher.Filter = "(&(objectCategory=Person)(objectClass=User)(whenChanged>=" + sDate + "))";

//Search only the users which are updated in Active Directory on the same day

string username = currentUser.LoginName.Split('\\')[1].ToString();//Get current user name

searcher.Filter = "samaccountname=" + username.ToString();

//Search & Load only specific properties of current user

searcher.PropertiesToLoad.Add("displayName");

searcher.PropertiesToLoad.Add("mail");

searcher.PropertiesToLoad.Add("employeeNumber");

SearchResult results = searcher.FindOne();

DirectoryEntry directoryEntry = results.GetDirectoryEntry();

//Display these properties in the lable control

lblEmpName.Text = directoryEntry.Properties["displayName"][0].ToString();

lblEmail.Text = directoryEntry.Properties["mail"][0].ToString();

lblEDP.Text = directoryEntry.Properties["employeeNumber"][0].ToString();