How to hide a column (GridView) but still access its value?

by 
<head runat="server">
<title>Accessing GridView Hidden Column value </title>
<style type="text/css">
  .hiddencol
  {
    display: none;
  }
</style>

<asp:BoundField HeaderText="Email ID" DataField="EmailId" ItemStyle-CssClass="hiddencol" HeaderStyle-CssClass="hiddencol" >
</asp:BoundField>

ArrayList EmailList = new ArrayList();
foreach (GridViewRow itemrow in gvEmployeeDetails.Rows)
{
  EmailList.Add(itemrow.Cells[YourIndex].Text);
}

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