title: How to append string to a JSON string derived from a blob using .NET?
body: <p>I am trying to append a string to the JSON content extracted from a blob. The JSON content is similar to below.</p>
  
  <pre><code>    {
        "Subject": "Details",
        "FromAddress": "xyz@abc.com",
        "ToAddress": "123@890.com",
        "Body": "My name is {name} and I faced this {exception} error"
      }
  </code></pre>
  
  <p>In this, I have to append a name (e.g. Arvind) and an exception (e.g. SystemException) and send the formatted data to another method to send mail</p>
  
  <pre class="lang-cs prettyprint-override"><code>string data = EmailBlob.DownloadTextAsync().Result;
  EmailData emailData = JsonConvert.DeserializeObject&lt;EmailData&gt;(data);
  </code></pre>
  
  <p>The variable <code>data</code> holds the following JSON</p>
  
  <pre><code>{
    "Subject": "Details",
    "FromAddress": "xyz@abc.com",
    "ToAddress": "123@890.com",
    "Body": "My name is {name} and I faced this {exception} error"
  }
  </code></pre>
  
  <p>The variable emailData holds the below.</p>
  
  <pre><code>  Subject: "Details",
    FromAddress: "xyz@abc.com",
    ToAddress: "123@890.com",
    Body: "My name is {name} and I faced this {exception} error"
  </code></pre>
  
  <p>Now I have to update the name 'Arvind' and exception 'SystemException' and send the emaildata variable to another method as below.</p>
  
  <pre><code>  Subject: "Details",
    FromAddress: "xyz@abc.com",
    ToAddress: "123@890.com",
    Body: "My name is Arvind and I faced this SystemException error"
  </code></pre>
  
  <p>How could I achieve it using C#.NET?</p>