1.Question: And who can explain how to work with the memory of the phone? For example, open and save files, create folders, etc.?
Answer: Work with a piece of phone memory which is a sandbox for the program.
http://blog.zwezdin.com/ru/201

2.Question: But do not tell me how to get the source code of the site page?
Answer: Normal GET request.

3.Question: By the way, who knows what about the native code? Something said before about the possibility of using COM.
Answer: Only OEMs can interact with unmanaged code.

4.Question: How to register (or whatever) the settings page so that you can see in Settings in Application Settings?
Answer: At the moment, no, use a separate page in your application.

5.Question: Tell me, how can a XNA application add a text file or a file with parameters to the resources (not the application settings), and then read it in the program?
Answer: I use Application.GetResourceStream in my project. This method returns a StreamResourceInfo, from there you can pull the stream through the Stream property. But I'm afraid that with XNA this will not work, although for both of them Application is a static class, but it's worth a try. And yes, the main thing in the properties of the file itself is to put Build Mode on Content.
Here is an example of use:
var stream = Application.GetResourceStream (new Uri (path_to_file_of_relative_package, UriKind.Relative)). Stream;

6.Question: How do I make a block with large text? A simple TextBlock displays only one line.
Answer: Just set the TextWrap property = Wrap

7.Question: Is there something like a device name or owner name in WP7? By analogy with WM 6.5 (CurrentUser \ ControlPanel \ Owner Name key)
Answer: Not a name, but a unique identifier, moreover, an anonymous one (not according to Senka's head, a simple developer knows the name of the user)
string id = UserExtendedProperties.GetValue ("ANID") as string;
string realid = id.Substring (2, 32); // otherwise it will be non-unique

8.Question: How easy is it to break WP7 application (* .xap)? Applications written in .net, for example, are edited in a notebook, a separate software, you can view the source code.
Answer: Relatively easy to install on unlocked device

9.Question: Are there any ways to protect the code? By analogs with obfuskatsii in C #.
Answer: The same obfuscation works on WP7. Preemptive Dofuscator from version 4.9 can obfustsirovat whole XAP.

10.Question: Where and how best to store the application settings? On WM 6.5 I used a ready-made class for working with ini files, the configuration file was stored in the program folder.
Answer: IsolatedStorageSettings or Isolated Storage. The first option is preferable for small data, because serialized to XML.

11.Question: Is it possible to realize the sale of applications without AppHub? I would like to start selling "locally" first, say, based on linking the serial number to any PDA parameter
Answer: The non-advanced user (and most of them) will send the forest. "I have to 'unlock' the device with a perverted method, it's unclear to download, which is not clear from where, and it is also not clear where to pay ?????"

12.Question: Why when using WebClient my application hangs, even on a separate thread.
Answer: The current implementation of the WebClient runs in the application's UI thread. Use HttpWebRequest.

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