Hi,
For this you can use RowDataBound event of gridview. refer this:
protected void GVSummaryTable_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.Cells.Count > 0)
{
if (e.Row.RowType == DataControlRowType.Header)
{
e.Row.Cells[0].Text = DateTime.Now.toString();
}
}
}
This may help you.
All the best.
--Amit