Then I remembered — C# already provides a built-in utility for this:

Before:

 queryParameters = new NameValueCollection();

            var queryString = Request.QueryString.ToString();
            if (!string.IsNullOrEmpty(queryString))
            {
                string[] querySegments = queryString.Split('&');

                foreach (string segment in querySegments)
                {
                    string[] parts = segment.Split('=');
                    if (parts.Length > 0)
                    {
                        string key = parts[0].Trim(new char[] { '?', ' ' });
                        string val = parts[1].Trim();

                        if (string.IsNullOrEmpty(queryParameters.Get(key)))
                        {
                            string decodedUrl = HttpUtility.UrlDecode(val);
                            val = decodedUrl.Split(',')[0];
                            queryParameters.Add(key, val);
                        }
                    }
                }
            }

After:

queryParameters = HttpUtility.ParseQueryString(Request?.Url?.Query ?? string.Empty);

With just one line of code, you can replace what used to take several lines of manual string splitting and decoding.

💡 Lesson learned: Don’t reinvent the wheel.
Always check if the language already provides a built-in, optimized function for what you’re trying to do.

It’s not PHP this time 😅 — but I thought it was worth sharing anyway.