HOW TO USE THIS ?

[varmaswathy81]

I have a question about the verb "use".

Is it necessary to use "by" before the word 'using'?

Here is the example,

Using this device, you will get positive results.

You will get many positive results by using this device.

Are these two sentences correct?

[bhaisahab]

I have a question about the verb "use".

Is it necessary to use "by" before the word 'using'?

Here is the example,

Using this device, you will get positive results.

You will get many positive results by using this device.

Are these two sentences correct?

Both are correct with or without "by".

[varmaswathy81]

Thank you so much.

[Raymott]

How to use this?

Note: The above is not a proper English sentence or question:
"How to do X?" does not have a finite verb. It's a dependent clause without a main clause.

(This is an semi-automated reply)