How to get list of files by folder on Google Drive API

I am trying to build a web UI for users to navigate his/her Google Drive and select one or more documents to be referenced later on in a website from a DB. I am currently building a web interface using .NET. The problem I am facing is that I can not find a single function to get a list of files by folder Id. I tried using: ...www.googleapis.com/drive/v2/files/BB0CHANGEDIDF5waGdzbUQ5aWs/children …but that will only give the files reference ID of the files within the folder (the so called children resource item), which means I have to loop through those files and create a call for each one of them in order to get all the metadata I need for my UI. Unfortunately.. ...www.googleapis.com/drive/v2/files ..will list ALL my files with no filtering options by folder. I would like to know if there is an efficient way of extracting a folder& file list from a single call to the Drive server by for a specific folder. I also tried this (based on answer to the similar issue): I am using Fiddler to do direct calls to the api. When I use this to make the call ` ...www.googleapis.com/drive/v2/files?q='BB0CHANGEDIDF5waGdzbUQ5aWs' I get an error: ``` { "error": { "errors": [ {wrongID "domain": "global", "reason": "invalid", "message": "Invalid Value", "locationType": "parameter", "location": "q" } ], "code": 400, "message": "Invalid Value" } } ``` Even using google's test page does not do it. It looks like the "files" endpoint does not accept any parameter. There has to be a way to achieve this! Thank you for your help