title: Data format issue. Export GridView to Excel
body: <p>There was a string <code>(1008901023816550000000)</code> in the GridView somehow was saved as a scientific number <code>(1.0089E+21)</code> in Excel when I exported the GridView to Excel. </p>
  
  <p>I am using .Net 4.0.</p>
  
  <p>Here is what I tried, but they didn't solve the problem:</p>
  
  <ol>
  <li>Added <code>DataFormatString="{0:g}"</code> to the <code>BoundColumn</code> tag.</li>
  <li>Set the <code>style</code> after the <code>RenderControl</code> was called.</li>
  </ol>
  
  <pre><code>    string style = @"&lt;style&gt; .text { mso-number-format:\@; } &lt;/script&gt; ";
  </code></pre>
  
  <p>Can anyone shed some light on this problem?</p>