I'm wondering the performance differences between instantiating a class once in a form or whenever it is needed. For example, say I have a customer form to edit a customer. On the form load, I instantiate a customer class and call a function to return the customer data to populate the form controls.

```
CustomerInfo customer = new CustomerInfo();
CustomerDetail  cust = customer.GetCustomer(customerId);
txtName. cust.Name;
...

```

Also on the form there is a save button. When that button is clicked, I create another instance of the Customer class to update the data.

```
CustomerDetail cust = new CustomerData();
cust.Id = customerId;
cust.Name = txtName.Text;

CustomerInfo customer = new CustomerInfo();
customer.Update(cust);

```

I know this works fine. However, is it better, performance wise, just to create a single instance of the Customer class for the whole form to call both GetCustomer and Update? I know the GC will take care of those instances, but I'm not sure it would destroy the first instance before going on to the next. 

Also, this example I use just two function calls to customer class, but, really, there could be more.

Thanks for the help.