private void removeAnimal_Click(object sender, RoutedEventArgs e)
    {
            string consulta = "DELETE from AnimalZoo where ZooId = @ZooId AND AnimalId = @AnimalId";
            SqlCommand sqlCommand = new SqlCommand(consulta, sqlConnection);

            sqlConnection.Open();
            sqlCommand.Parameters.AddWithValue("@ZooId", listZoos.SelectedValue);
            sqlCommand.Parameters.AddWithValue("@AnimalId", listAssociatedAnimals.SelectedValue);
            sqlCommand.ExecuteScalar();
       
            sqlConnection.Close();
            showAssociatedAnimals();
    }