How can i change excel cell value
<p>i m exporting data from gridview to excel. 
This is my exported column:</p>

<pre><code>POSTING KEY
1
50
50
</code></pre>

<p>but the column seems in the gridview like that:</p>

<pre><code>POSTING KEY
01
50
50
</code></pre>

<p>Excel convert my string values to numeric  when after export. But i must see "01". How can i change  excel cell type or cell value in code when before save file.?</p>
