How to change a control's Placeholder by device?

Question

Using Sitecore 7 - Is there a way I can specify what the placeholder of a template's control will be based on device?

Example : Placeholder A if the device is Mobile else Placeholder B

This is more to do with positioning the content differently in Mobile than desktop site.

UPDATE

Trayek's answer is great and would sure work. Although, I ended up using a different approach.

In the layout details of my template, I added a control C; set its placeholder as A and added HideBydevice Desktop in the additional Parameters section. Then, I again added control C; set its placeholder as B and added HideBydevice Mobile in the additional Parameters section.

Then in my code, I check HideBydevice parameter's value and hide the sublayout/control, if the parameter's value is the same as Sitecore.Context.Device.Name

This worked for me.

Answer 1

What you can probably do is use Sitecore's Rules Engine, where you can create (or use a pre-existing) Condition to find out whether you are on a mobile device (to do this, you could use the Mobile Device Detector for instance - although I don't know if that module is supported on Sitecore 7).
Then, you can also use the Action Set placeholder to value.

You could also create your own Action instead, of course. All you'd have to do is get the RenderingReference and simply change the placeholder like so:

var reference = new RenderingReference(this.RenderingID);
reference.Placeholder = "A";

More on this in the Rules Engine Cookbook

Update
I've written a blog post about how to get this done: Read it here.