public void Clear ()
{
this.ID = string.Empty;
this.Email = string.Empty;
this.FacebookID = string.Empty;
this.TwitterID = string.Empty;
this.GoogleID = string.Empty;
this.Password = string.Empty;
this.Name = string.Empty;
this.LastName = string.Empty;
this.Gender = -1;
this.Height = -1;
this.Weight = -1;
this.Birthday = string.Empty;
}