GitHubApi.cs

public class GitHubApi
	{
		public async Task<List<string>> GetAsync(string user)
		{
			string url = string.Format("https://api.github.com/users/{0}/repos", user);

			var client = new HttpClient();
			client.DefaultRequestHeaders.Add("User-Agent", "Other");

			var response = await client.GetAsync(url);
			var content = await response.Content.ReadAsStringAsync();

			var json = JArray.Parse(content);

			var repositories = new List<string>();
			foreach (var item in json) {
				var repository = item.Value<string>("full_name");
				repositories.Add(repository);
			}
			return repositories;
		}
	}