Not using by means that the technology used is incidental, and the focus is on the approach being shown to be feasible. Without more context it's impossible to say what the intended import of the sentence is and whether by would actually be better or not.
Foam rollers are everywhere these days—at the gym, under your desk, collecting dust under the sofa—but does anyone actually know how to use a foam roller? Done well, foam rolling can ease tightness, ...
MSN: How to Use a Foam Roller Like Someone Who Knows What They're Doing
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How to Use a Foam Roller Like Someone Who Knows What They're Doing
User kokos answered the wonderful Hidden Features of C# question by mentioning the using keyword. Can you elaborate on that? What are the uses of using?
By using a joystick or a pointing device, an on-screen keyboard allows people with mobility impairments to type data. The second sentence states that the on-screen keyboard is the one that uses the joystick or pointing device to allow impaired people to type data.
Update May 2018. As many noted in the comments that using SHA-2 does not add any security to a self-signed certificate. But I still recommend using it as a good habit of not using outdated / insecure cryptographic hash functions. Full explanation is available in Why is it fine for certificates above the end-entity certificate to be SHA-1 based?.
Yes Yes. Either way, when the using block is exited (either by successful completion or by error) it is closed. Although I think it would be better to organize like this because it's a lot easier to see what is going to happen, even for the new maintenance programmer who will support it later:
c# - in a "using" block is a SqlConnection closed on return or ...
Using a regular expression that recognizes email addresses could be useful in various situations: for example to scan for email addresses in a document, to validate user input, or as an integrity constraint on a data repository.
Using the using keyword can be useful. Using using helps prevent problems using exceptions. Using using can help you use disposable objects more usefully. Using a different using helps you use namespaces or type names. Quite useful.
The using statement allows the programmer to specify when objects that use resources should release them. The object provided to the using statement must implement the IDisposable interface. This interface provides the Dispose method, which should release the object's resources.
What is the C# Using block and why should I use it? [duplicate]
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GQ: How to Use a Foam Roller Like Someone Who Knows What They're Doing