title: LINQ: How to do JOIN using the linq extension method style on multiple fields?
body: <p>In the Join below, I'd like to use multiple fields to do the join rather than just one field.</p>
  
  <pre><code>var join = group.Join(procSums, g =&gt; g.DeptID, ps =&gt; ps.key.deptID, (g, ps)...
  </code></pre>
  
  <p>All examples Ive found use the query style to do this and I can't translate it.</p>
  
  <p>Thanks!</p>