/// <summary>
/// Creates a request elements concatentation value to send with a request.
/// This is also known as the signature base.
/// </summary>
/// seealso cref="http://oauth.net/core/1.0#rfc.section.9.1.3"
/// seealso cref="http://oauth.net/core/1.0#sig_base_example"
/// <param name="method">The request's HTTP method type</param>
/// <param name="url">The request URL</param>
/// <param name="parameters">The request's parameters</param>
/// <returns>A signature base string</returns>
public static string ConcatenateRequestElements(WebMethod method, string url, WebParameterCollection parameters)
{
var sb = new StringBuilder();
// Separating &'s are not URL encoded
var requestMethod = method.ToUpper().Then("&");
var requestUrl = UrlEncodeRelaxed(ConstructRequestUrl(url.AsUri())).Then("&");
var requestParameters = UrlEncodeRelaxed(NormalizeRequestParameters(parameters));
sb.Append(requestMethod);
sb.Append(requestUrl);
sb.Append(requestParameters);
return(sb.ToString());
}