title: Declaring an empty Queryable?
body: <p>How do I declare such a variable?</p>
  
  <pre><code>            var rData = from nc in ctx.NEWSLETTER_CLIENTS
                          join ni in ctx.NEWSLETTER_INDICES on nc.INDEX_NUM 
                                                            equals ni.INDEX_NUM
                          select new
                          {
                              ClientID = nc.CLIENT_ID,
                              Email = nc.CLIENT_EMAIL_ADDRESS,
                              Index = nc.INDEX_NUM,
                              MainClass = ni.MAIN_CLASS,
                              SubClass = ni.SUB_CLASS,
                              App1 = ni.VALUE_1,
                              App2 = ni.VALUE_2,
                              App3 = ni.VALUE_3,
                              App4 = ni.VALUE_4
                          };
  
          // Now I need to declare on a variable named fData under the function scope,
          // so I can later use it:
  
          var fData = ...; //What do I declare here?
  
          if(x)
              fData = fData.Concat(rData.Where(u =&gt; ...));
          if(y)
              fData = fData.Concat(rData.Where(u =&gt; ...));
          // etc
  </code></pre>