title: Real time streaming in a firebase database
body: <p>Im implementing a function which is to get the data in a specific child in my firebase database whenever something is added but I am getting an error 
  "The call is ambiguous between the following methods or properties..."</p>
  
  <p>Is there a way to fix this error? Thanks in advance</p>
  
  <pre><code>var observable = firebase
            .Child("Sold/Item")
            .AsObservable&lt;SoldProductsData&gt;()
            .Subscribe(d =&gt; MessageBox.Show(d.Key));
  </code></pre>