How to build a query string for a URL in C#?

Question

A common task when calling web resources from a code is building a query string to including all the necessary parameters. While by all means no rocket science, there are so

Answer 1

I went with the solution proposed by DSO (answered on Aug 2 '11 at 7:29), his solution does not require using HttpUtility. However, as per an article posted in Dotnetpearls, using a Dictionary is faster (in performance) than using NameValueCollection. Here is DSO's solution modified to use Dictionary in place of NameValueCollection.

    public static Dictionary QueryParametersDictionary()
    {
        var dictionary = new Dictionary();
        dictionary.Add("name", "John Doe");
        dictionary.Add("address.city", "Seattle");
        dictionary.Add("address.state_code", "WA");
        dictionary.Add("api_key", "5352345263456345635");

        return dictionary;
    }

    public static string ToQueryString(Dictionary nvc)
    {
        StringBuilder sb = new StringBuilder();

        bool first = true;

        foreach (KeyValuePair pair in nvc)
        {
                if (!first)
                {
                    sb.Append("&");
                }

                sb.AppendFormat("{0}={1}", Uri.EscapeDataString(pair.Key), Uri.EscapeDataString(pair.Value));

                first = false;
        }

        return sb.ToString();
    }