/// <summary>
/// Ask user to input customer ID. If customer with this ID exists method
/// returns customer location
/// </summary>
/// <returns></returns>
public void CustomerIdToLocation(ref int customerId, ref string location)
{
customerId = CheckIfCustomerExist();
while (customerId < 1)
{
customerId = CheckIfCustomerExist();
}
location = customerController.FindCustomerLocationById(customerId);
}