/// <summary>
 /// Returns user's email by user's name.
 /// </summary>
 /// <param name="username">User's name.</param>
 /// <param name="PortalID">Portal ID.</param>
 /// <returns>User's last name.</returns>
 public static string GetUserEmail(string username, Int32 PortalID)
 {
     MessageManagementController objController = new MessageManagementController();
     MessageManagementInfo objInfo = objController.GetUserEmail(username, PortalID);
     return objInfo.Email;
 }