title: Missing compiler required member 'microsoft.csharp.runtimebinder.binder.convert'
body: <p>I first time using Excel to reading data in c# with Selenium WebDriver, but when I build this code, it pops up an error:</p>
  
  <blockquote>
    <p>"Missing compiler required member 'microsoft.csharp.runtimebinder.binder.convert'"</p>
  </blockquote>
  
  <p>and the code for using excel is marked in red bellow:</p>
  
  <pre><code> excel.Application x1Appl = new excel.Application();
   excel.Workbook x1WorkBook = x1Appl.Workbooks.Open(@"C:\app\o\SearchBy.xlsx");
  
   excel._Worksheet x1WorkSheet = x1WorkBook.Sheets[1];
  </code></pre>
  
  <p>Please let me know what is missing? Thank you!</p>