This how to setup windows 10 in raspberry pi and get coding...
Step 1: Setup and Completion
Head over to Windows IoT(http://ms-iot.github.io/content/en-US/GetStarted.htm)
and choose Raspberry Pi 2. Follow the instructions on the Raspberry Pi page to:
Download the Windows_IoT_Core_RPI2_BUILD.zip file and extract it. If you see an empty list of downloads on the download page, follow the instructions at the top of this page to sign up for the Microsoft Connect program.Use the dism.exe command shown on the setup page to deploy the image to the card. You cannot write the image to the card using dd or any other disk imager; it will not work because dism prepares the partitions on the card as well as copies files.Install the SD card, connect your peripherals, and plug your Pi into the same Ethernet network that your Windows 10 computer’s connected to. If your computer has an Ethernet port, you may be able to connect them directly. The PC setup page, which should be your next stop, has some tips on configuring connection sharing if you do a direct Ethernet connection between your PC and Pi. Note: The PC setup page will tell you to install Windows 10 Insider Preview and Visual Studio 2015 RC. If you’ve done that already, you just need to install the WindowsDeveloperProgramForIoT.msi file and configure networking between the Pi and the PC, both of which are explained on this page.
The first time you power on the Pi, the activity LED will flash for a few seconds, then stop for a couple minutes. After Windows finishes its initial configuration, the LED should start flashing again, and you should see the Ethernet link lights come on as well.
You are all set up now: you’ve installed Windows 10 Insider Preview on your PC, along with Visual Studio 2015 Release Candidate, the Windows 10 SDK, and WindowsDeveloperProgramForIoT.msi package. If your Windows machine can see the Raspberry Pi, you’re good to go