title: How do I iterate an IGrouping<T> Interface?
body: <p>Ive got ths really annoying issue I have grouped a set of data and I cant get to the data within the group. I can get to the key bit not the data..</p>
  
  <p>I have a load of data that is in the form</p>
  
  <pre><code>Data.Period = x
  Data.Adjustment = y
  </code></pre>
  
  <p>I perform a GroupBy</p>
  
  <pre><code>var groupedData = Data.GroupBy(x =&gt; x.Period new {x.Period});
  </code></pre>
  
  <p>This brings back (according to linq) my hierarchical data which is starting to look how I want it. Id like to iterate through the contents but cant...How do I do this? and how do I...</p>
  
  <p>Work how to get to the Data.Adjustment without using a projection. And I dont want to project yet because I have to perform another grouping....help! :-)</p>