ueType">long</span> total = 0;     <br /><span class="Statement">foreach</span> (<span class="ValueType">int</span>? item <span class="Statement">in</span> source)     <br />{     <br />&#160;&#160;&#160; <span class="Statement">if</span> (item != <span class="Keyword">null</span>)     <br />&#160;&#160;&#160; {     <br />&#160;&#160;&#160;&#160;&#160;&#160;&#160; count++;     <br />&#160;&#160;&#160;&#160;&#160;&#160;&#160; total += item.Value; <span class="InlineComment">// This line can be optimized...</