title: Why LinqToExcel is returning null when encounters "-" character?
body: <p>I'm using LinqToExcel to retrieve some information and I can get the data from all my columns except from one. This is the Scenario:</p>
  
  <p>I have 3 columns:</p>
  
  <pre><code>Code   Name   LastName
   89    test1   test2
   89-2  test3   test4
   90    test5   test6
  </code></pre>
  
  <p>and to get the list of values I use:</p>
  
  <pre><code>var excel = new LinqToExcel.ExcelQueryFactory(path)
  var excelValues = excel.Worksheet&lt;Sheet&gt;("Sheet1").AsEnumerable().Where(p =&gt; !String.IsNullOrWhiteSpace(p.Code));
  </code></pre>
  
  <p>This returns the following information:</p>
  
  <pre><code>89  |test1|test2
  null|test3|test4 //here is my problem
  90  |test5|test6
  </code></pre>
  
  <p>If I change the 89-2 to be 89.2 then it works. Is there any way I can escape the "-" character? or what I'm doing wrong.</p>