title: Search inside List<T> for 2 columns that match
body: <p>I want to store objects in a List and have therefore
  created a class with 3 properties; prop1. prop2 and prop3.</p>
  
  <p>To add a new Item to my List I'm using for example</p>
  
  <pre><code>_st.Add(new Bld(100,20,"Test1");
  _st.Add(new Bld(101,20,"Test2");
  _st.Add(new Bld(102,54,"Test3");
  </code></pre>
  
  <p>Now: How can I search the list to get the index of an Item
  that contains <code>myObj.prop2 = 20 AND myObj.prop3="Test1"</code>?</p>
  
  <p>I've tried something like</p>
  
  <pre><code>_st.Where(tk =&gt; tk.prop1 == 1000 AND tk.Title == "Test1");
  </code></pre>
  
  <p>but this obviously doesn't work.</p>
  
  <p>Any idea how to solve this problem?</p>
  
  <p>Thanks in advance</p>