private void Subscriber_Load(object sender, EventArgs e)
 {
     if (id_subscriber != -1)
     {
         // Edit Subscriber
         string[] subscriber_array = new string[8];
         btnAddSubscribers.Text = "Edit";
         subscriber_array       = FablabDB.loadSubsciber(id_subscriber);
         txtName.Text           = subscriber_array[0];
         txtSurname.Text        = subscriber_array[1];
         txtDateOfBirth.Text    = subscriber_array[2];
         txtAddress.Text        = subscriber_array[3];
         txtCity.Text           = subscriber_array[4];
         txtCountry.Text        = subscriber_array[5];
         txtPostcode.Text       = subscriber_array[6];
         txtTelephone.Text      = subscriber_array[7];
         txtEmail.Text          = subscriber_array[8];
     }
 }