else  set @SQL='select top '+str(@pageSize) +' * from ( select top '+str(@recordCount - @pageSize * @pageIndex)+' productID,productName, unitPrice from products order by productID desc) TempTable order by productID asc'

        private uint pageCount;  //总页数

        private DataSet GetPageData(uint pageSize, uint pageIndex)

        {

            string strConn = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];           

            SqlConnection conn = new SqlConnection(strConn);

            conn.Open();

            SqlCommand command = new SqlCommand("GetCustomDataPage",conn);  //第一个参数为存储过程名

            command.CommandType = CommandType.StoredProcedure;   //声明命令类型为存储过程

            command.Parameters.Add("@pageSize",SqlDbType.Int);

            command.Parameters["@pageSize"].Value = pageSize;

            command.Parameters.Add("@pageIndex",SqlDbType.Int);

            command.Parameters["@pageIndex"].Value = pageIndex;

            command.Parameters.Add("@pageCount",SqlDbType.Int);

            command.Parameters["@pageCount"].Value = pageCount;

            command.Parameters["@pageCount"].Direction = ParameterDirection.Output;  //存储过程中的输出参数

            command.Parameters.Add("@recordCount",SqlDbType.Int);

            command.Parameters["@recordCount"].Value = recordCount;

            command.Parameters["@recordCount"].Direction = ParameterDirection.Output; //存储过程中的输出参数

            SqlDataAdapter adapter = new SqlDataAdapter(command);

            DataSet ds = new DataSet();

            adapter.Fill(ds);           

            //获得输出参数值

            pageCount = Convert.ToUInt32(command.Parameters["@pageCount"].Value);

            recordCount = Convert.ToUInt32(command.Parameters["@recordCount"].Value);

            conn.Close();

            return ds;

        }

        //绑定数据到DataGrid中

        private void BindDataGrid()

        {

            DataSet ds = GetPageData((uint)dgProduct.PageSize,(uint)dgProduct.CurrentPageIndex);

            dgProduct.VirtualItemCount = (int)recordCount;

            dgProduct.DataSource = ds;

            dgProduct.DataBind();

        }

        //页面加载时就绑定DataGrid

        private void Page_Load(object sender, System.EventArgs e)

        {

            if(!Page.IsPostBack)

            {

               BindDataGrid();

            }

        }

        //用户翻页时事件处理

        private void dgProduct_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)

        {

            dgProduct.CurrentPageIndex = e.NewPageIndex;

            BindDataGrid();

        }

        //用户单击编辑按纽时事件处理

        private void dgProduct_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)

        {

            dgProduct.EditItemIndex = e.Item.ItemIndex;

            BindDataGrid();

        }

        //用户单击取消按纽时事件处理

        private void dgProduct_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)

        {

            dgProduct.EditItemIndex = -1;

            BindDataGrid();

        }

        //用户单击更新按纽时事件处理

        private void dgProduct_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)

        {

            string strConn = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];           

            SqlConnection conn = new SqlConnection(strConn);

            conn.Open();

            //string strSQL = "update from products set productName=@productName, set unitPrice=@unitPrice where productID=@productID";

            string strSQL = "update products set productName=@productName where productID=@productID";

            SqlCommand command = new SqlCommand(strSQL,conn);

            command.Parameters.Add("@productName",SqlDbType.NVarChar,40);

            command.Parameters["@productName"].Value = ((TextBox)(e.Item.Cells[1].Controls[0])).Text.Trim();

            //command.Parameters.Add("@unitPrice",SqlDbType.Int);

            //command.Parameters["@unitPrice"].Value = Convert.ToInt32(((TextBox)(e.Item.Cells[2].Controls[0])).Text.Trim());

            command.Parameters.Add("@productID",SqlDbType.Int);

            command.Parameters["@productID"].Value = dgProduct.DataKeys[e.Item.ItemIndex];

            command.ExecuteNonQuery();

            conn.Close();

            dgProduct.EditItemIndex = -1;

            BindDataGrid();

        }

       //用户单击删除按纽时事件处理

        private void dgProduct_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)

        {

            string strConn = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];

            SqlConnection conn = new SqlConnection(strConn);

            conn.Open();

            SqlCommand command = new SqlCommand("DeleteProduct",conn);

            command.CommandType = CommandType.StoredProcedure;

            command.Parameters.Add("@productID",SqlDbType.Int);

            command.Parameters["@productID"].Value = dgProduct.DataKeys[e.Item.ItemIndex];

            command.ExecuteNonQuery();

            BindDataGrid();

        }

        //实现删除确认及颜色交替显示功能

        private void dgProduct_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)

        {

            if(e.Item.ItemType == ListItemType.Item ||e.Item.ItemType == ListItemType.AlternatingItem)

            {

               Button btnDelete = (Button)(e.Item.Cells[4].Controls[0]);

               btnDelete.Attributes.Add("onClick","JavaScript:return confirm('确定删除？')");

               e.Item.Attributes.Add("onMouseOver","this.style.backgroundColor='#FFCC66'");

               e.Item.Attributes.Add("onMouseOut","this.style.backgroundColor='#ffffff'");

            }