Windows Phone (WP) Interview Preparation Guide

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No. this property is true all the time for the phone

This is not in the CTP, but will be in later builds: Guide.BeginShowKeyboardInput

The games are installed in games hub, which you can't see in the currently slimmed image. Change the Genre attribute in the App element in WindowsPhoneManifest.xml from App.Games to NormalApp
<App xmlns="" ... RuntimeType="XNA" Version="1.0.0.0" Genre="NormalApp" >

The XNA Framework defaults to landscape mode for Windows Phone games, but XDE doesn’t yet support XNA in landscape mode, so portrait mode is the only option there for now. You can set your orientation preferences by using GraphicsDeviceManager settings (SupportedOrientations, PreferredBackBufferHeight, PreferredBackBufferWidth, etc.

From Shawn Hargreaves blog For this release, there are no programmable shaders: “Instead of programmable shaders, we augmented the existing BasicEffect with four new configurable effects: SkinnedEffect, EnvironmentMapEffect, DualTextureEffect, and AlphaTestEffect. These are designed to run efficiently on the mobile GPU hardware, and I think do a good job of providing enough flexibility for developers to create awesome looking games, while also meeting our goals of being able to ship a robust and well tested product on schedule.”

Not at this time. The behaviors have dependencies in Silverlight 4.

Yes, it’s a known problem in the emulator on machines that don’t support the hardware accelerated graphics in the emulator. It works properly on devices and machines that do

You can not launch two instances from the Phone tools. You can launch a second instance from command line.
c:\Program Files (x86)\Microsoft XDE\1.0\XDE.exe" "C:\Program Files (x86)\Microsoft SDKs\WindowsPhone\v7.0\Emulation\Images\WM70C1.bin"

Try running Devenv /setup.
Running devenv /installvstemplate might also work; but that is going to slow down overall VS performance. The /installvstemplate is a development only option that makes it easy for developer to test their templates. This shouldn’t be used on end user machines. Devenv /setup does a lot of more processing and caching to speed up VS performance.

This is a known bug in MIX CTP and April refresh. Sorry! It will be addressed in next build

Check System.Environment.DeviceType

DesignerProperties.IsIndesignTool

The following conditions should be met for a valid OnDeserialized callback.

1. The accessibility of the method should be public. It can also be internal with InternalsVisibleTo provided to the System.Runtime.Serialization assembly.
2. Return type should be void.
3. There should be exactly one parameter which should be of the type StreamingContext.
4. There should be only one of the four callbacks provided on the method.

Try IsolatedStorage.GetLastWriteTime

You can use the IsolatedStorageSettings.ApplicationSettings.

It gets deleted. Content saved to media libary is not deleted on Uninstall

You don't have to. There is no limit

Use DataContractJsonSerializer. it is in System.Servicemodel.Web

No. Securestring is not in Silverlight.

In this release, the credentials are not available to third party apps. You will need to prompt the user for credentials and manage these within your app.

Make sure you have a product / publisher name set in the manifest.
Open WindowsPhonepmanifest.xml, under Properties. Edit Publisher="" to Publisher="something". Redeploy.

This is a known issue in April CTP. Should be fixed in later builds

Not in v1.

Instead of XmlDocument, use XDocument from System.Xml.Linq.dll

Not in v1.