How to get access token from browser?

What we usually suggest is to use the WebBrowser control. Why are you trying to avoid that?

Thanks for answering Steve. I just want to use a button connect and then a browser tab to open for log in ( in Internet Explorer for example ) and after the login to store the access token in my app. Is this possible ? Same thing is done by this function of Google Drive : 
GoogleWebAuthorizationBroker.AuthorizeAsync(ClientSecret, scopes, Environment.UserName, CancellationToken.None, new SavedDataStore(GoogleTokenStoredResponse)).Result

We don't have anything like that built in. We encourage people to use an embedded web browser in their app.

Hi Steve,

I tried to do something like this to get the uri ,but in my response I don't get the new uri, which contains the access token .

Uri uri = new Uri("https://api.dropboxapi.com/1/oauth2/authorize?response_type=token&client_id=my_client_id");
System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
request.Method = System.Net.WebRequestMethods.Http.Post;

System.Net.WebResponse response = request.GetResponse();

Am I missing something or this is not correct?

PS: If i create a uri like https://www.dropbox.com/1/oauth2/authorize?response_type=token&client_id=my_client_id&redirect_uri=my_uri , I get a new uri like this my_redirect_uri/#access_token=dhGV8R5SRjIDDDDDDa8xOY5JXtDiTahVAg4I9eP3gsvtJqxuyc_OKfM7iTYfd&token_type=bearer&uid=2623212259 . This is the uri which I want to get with my request.

Thank you

I'm not sure what you're trying to do. The /authorize URL you're constructing is one that the user should browse to, not something you should try to invoke programmatically. It's the page where the user logs in to Dropbox and then clicks the "Allow" button to grant access to your app.

Have you tried following the example code here? http://dropbox.github.io/dropbox-sdk-dotnet/html/T_Dropbox_Api_DropboxOAuth2Helper.htm

Yes . I tried this one(my first try). Currently I'm using this method:

 Uri authorizeUri = DropboxOAuth2Helper.GetAuthorizeUri(OauthResponseType.Token, appKey, RedirectUri, state: oauth2State);

And then I called  System.Diagnostics.Process.Start(authorizeUri.ToString()) to open the browser with authorizeUri. Next step is that the user copies the responseUri to a textbox and then I have another button GetTokenBtn which calls ParseTokenFragment(responseUri) to obtain the token. 

Simply said , what I  wanted was to open a the browser,which contains the authentification(email and password of dropbox user to skip authentification) with authorize uri , then the resulting uri(responseUri) from the browser to be sent back to my application and then to call from my application ParseTokenFragment(responseUri) to obtain my token.

If that is not possible without searching into opened processes that will remain my solution.

Thanks for your support 

You can theoretically do this by registering for a custom URL scheme and using that as your redirect URI, but what we recommend is to embed a web browser control in your app, as per the example I linked to.