title: How to write json format in C# string?
body: <p>How i cab write a json format in C# string:</p>
  
  <pre><code>using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
          {
              string strNJson = @"{to:'topics/extrafx',notification:{title:{0},text:{1},sound: 'default'}}";
  
              strNJson = string.Format(strNJson, not_title, not_body);
              streamWriter.Write(strNJson);
              streamWriter.Flush();
          }
  </code></pre>
  
  <p>Please advice?</p>