Get SPUserField value

public string GetAdminEmailAddress(string room)

        {

            string userEmail = string.Empty;

            using (SPSite site = new SPSite(Config.URL))

            {

                using (SPWeb web = site.OpenWeb())

                {

                    SPList list = web.Lists[Config.MeetingRoomTitle];

                    SPQuery query=new SPQuery();

                    string camlQuery = string.Format(@"

                             <View>

                                <Query>

                                    <Where>

                                             <Eq>

                                                    <FieldRef Name='Title'/>

                                                    <Value Type='Text'>{0}</Value>

                                              </Eq>

                                    </Where>

                                 

                                </Query>

                            </View>", room);

                    query.Query=camlQuery;

                    SPListItemCollection items = list.GetItems(query);

                    try

                    {

                        SPListItem item = items[0];

                        object userField = item["Admin"];

                        if (null != userField)

                        {

                            SPFieldUserValue userValue = new SPFieldUserValue(web, userField.ToString());

                            SPUser user = userValue.User;

                            userEmail = user.Email;

                        }

                    }

                    catch (Exception ex)

                    {

                        Response.Write("Error: "+ex.Message);

                    }

                    return userEmail;

                }

            }

        }