public void AddInteresse(string interesse)
 {
     if (!InteressesOpslag.Split(';').Contains(interesse))
     {
         if (this.InteressesOpslag == "")
         {
             this.InteressesOpslag += interesse;
         }
         else
         {
             this.InteressesOpslag += ";" + interesse;
         }
     }
 }
 public void UpdateIntressesFromOpslag()
 {
     string[] array = InteressesOpslag.Split(';');
     this.Interesses = new List <string>(array).Where(x => x != "").ToList();
 }