public async Task GetCorrectedTextAsync()

in bot-integration-samples/hotel-finder/csharp/Services/BingSpellCheckService.cs [28:74]
32 lines of code
4 McCabe index (conditional complexity)

        public async Task<string> GetCorrectedTextAsync(string text)
        {
            if (string.IsNullOrEmpty(text))
            {
                return text;
            }

            using (var client = new HttpClient())
            {
                client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", ApiKey);

                var values = new Dictionary<string, string>
                {
                    { "text", text }
                };

                var content = new FormUrlEncodedContent(values);

                var response = await client.PostAsync(SpellCheckApiUrl, content);
                var responseString = await response.Content.ReadAsStringAsync();

                var spellCheckResponse = JsonConvert.DeserializeObject<BingSpellCheckResponse>(responseString);

                StringBuilder sb = new StringBuilder();
                int previousOffset = 0;

                foreach (var flaggedToken in spellCheckResponse.FlaggedTokens)
                {
                    // Append the text from the previous offset to the current misspelled word offset
                    sb.Append(text.Substring(previousOffset, flaggedToken.Offset - previousOffset));

                    // Append the corrected word instead of the misspelled word
                    sb.Append(flaggedToken.Suggestions.First().Suggestion);

                    // Increment the offset by the length of the misspelled word
                    previousOffset = flaggedToken.Offset + flaggedToken.Token.Length;
                }

                // Append the text after the last misspelled word.
                if (previousOffset < text.Length)
                {
                    sb.Append(text.Substring(previousOffset));
                }

                return sb.ToString();
            }
        }