private void tV_GroupItem_AfterSelect(object sender, TreeViewEventArgs e) { TreeNode selectNode = this.tV_GroupItem.SelectedNode; DataTable profileCus = new DataTable(); if (selectNode.Tag == "1") { dGV_Item.DataSource = _item.GetTableItemsMySQL_Sale(); } else { if (selectNode.Tag == "2") { dGV_Item.DataSource = _item.GetListItem_ForGroup_Sale(selectNode.Text); } } }