Convert.ToDateTime(drv["create_date"].ToString()).ToShortDateString()

protected void dgList_RowDataBound(object sender, GridViewRowEventArgs e)

  {

   if (e.Row.RowType == DataControlRowType.DataRow)

   {

  DataRowView drv = (DataRowView)e.Row.DataItem;

  if (!string.IsNullOrEmpty(drv["create_date"].ToString()))

     {

  e.Row.Cells[7].Text = Convert.ToDateTime(drv["create_date"].ToString()).ToShortDateString();

   }

  }

  }