Using OAuth 2.0 for Installed Applications

I am developing a Windows 8 App for Blogger which allows create and update 
blogs through the app.I am developing the app in C#/XAML using Visual 
Studio 2012. For the login of a user I follow this link on Auth 2.0 client.
https://developers.google.com/accounts/docs/OAuth2InstalledApp#choosingredirecturi

I have followed the initial step "Forming the URL" successfully  and was 
able to get the success code where it is asked to paste it in my 
application.
I created a separate interface to paste it manually and get it to a 
variable called code.

Then the next step, "Handling the Response" is unsuccessful in each time I 
try.
I request you to help me to get trough this step.

POST /o/oauth2/token HTTP/1.1
Host: accounts.google.com
Content-Type: application/x-www-form-urlencoded

code=4/v6xr77ewYqhvHSyW6UJ1w7jKwAzu&
client_id=8819981768.apps.googleusercontent.com&
client_secret={client_secret}&
redirect_uri=https://oauth2-login-demo.appspot.com/code&
grant_type=authorization_code



Please tell me the way I can send a "Post" request in C#  containing these 
information and get the stated successful response as below.

{
  "access_token":"1/fFAGRNJru1FTz70BzhT3Zg",
  "expires_in":3920,
  "token_type":"Bearer",
  "refresh_token":"1/xEoDL4iW3cxlI7yDbSRFYNG01kVKM2C-259HOF2aQbI"
}


PS: Only limited type of methods in C# are allowed in developing Windows 8 
apps.

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