private void dataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
            {
                  dataGrid1.CurrentPageIndex = e.NewPageIndex;
                  dataGrid1.DataSource = ds;
                  dataGrid1.DataKeyField = "ID";
                  dataGrid1.DataBind();
            }

            private void dataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
            {
                  if(e.Item.ItemType == ListItemType.Item ||
                  e.Item.ItemType == ListItemType.AlternatingItem)
                  {
                        DataGrid dataGrid2 = new DataGrid();
                        dataGrid2.ShowHeader = false;
                        dataGrid2.BorderWidth = 0;
                        dataGrid2.Width = Unit.Percentage(100);
                        dataGrid2.AutoGenerateColumns = false;
                        BoundColumn bc = new BoundColumn();
                        bc.DataField = "DETAILS";
                        bc.ItemStyle.Wrap = false;
                        dataGrid2.Columns.Add(bc);
                        DataView _dett = ds.Tables["details"].DefaultView;
                        _dett.RowFilter = "ID=" + e.Item.Cells[2].Text;
                        dataGrid2.DataSource = _dett;
                        dataGrid2.DataBind();
                        BoundColumn c = new BoundColumn();
                        c.HeaderText = "DETAILS";
                        c.ItemStyle.Wrap = false;
                        dataGrid1.Columns.Add(c);
                        e.Item.Cells[e.Item.Cells.Count-1].Controls.Add(dataGrid2);
                  }
            }