Hello Krishna,
You can do so in RowDataBound event handler. The following snippet should get you started.
protected void RowDataBound(Object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
int result = DateTime.Compare(e.Row.DataItem("DATE_COLUMN_NAME"), Date.Now);
if ( result < 0)
e.Row.Cells[0].BackColor = Color.Red;
}
}
Regards,