update user information list

SPWeb web = properties.OpenWeb();
           web.AllowUnsafeUpdates = true;

           SPList list = web.Lists["Távollétek"];
           SPListItem item = properties.ListItem;

           SPSite site = new SPSite("http://sp2010/sites/demo");
           SPWeb kezdo = site.OpenWeb();
           SPList felhasznalok = kezdo.Lists["User Information list"];
           
           
           string userReszleg = string.Empty;
           string nev = item["Name"].ToString();
           foreach (SPListItem felList in felhasznalok.Items)
           {
               if (nev == felList["Name"].ToString())
               {
                   userReszleg = felList["Department"].ToString();
               }
           }
           item["Department"] = userReszleg.ToString();
           item.Update();
           this.EventFiringEnabled = true;

SharePoint User Profiles - Internal Names

Two types of User Profiles:
1. WSS Profile - can be accessed from Welcome User > My Settings page (_layouts/userdisp.aspx?.......)

User Information List
Display Name	Internal Name
Account	Name
First name	FirstName
Last name	LastName
Name	Title
Work phone	WorkPhone
Office	Office
Department	Department
Title	JobTitle
Work e-mail	EMail
User name	UserName

2. MOSS profile - can be accessed from My Site (../Person.aspx?....). The MOSS profiles are created when users are imported into the system from AD or LDAP.

SSP User Profile
Display Name	Internal Name
Account name	AccountName
First name	FirstName
Last name	LastName
Name	PreferredName
Work phone	WorkPhone
Office	Office
Department	Department
Title	Title
Work e-mail	WorkEmail

Basically, there are two MOSS Timer jobs that control the replication of the user profiles per web application. These jobs can be found from Central Administration -> Operations -> Timer Job definitions.

1. Profile Synchronization - updates the WSS profiles.
2. Quick Profile Synchronization - updates the MOSS profiles.