如何使用DataView进行数据排序和检索

显示结果：

CustomerID	CompanyName	Country
WHITC	White Clover Markets	USA
TRAIH	Trail's Head Gourmet Provisioners	USA
THECR	The Cracker Box	USA
THEBI	The Big Cheese	USA
SPLIR	Split Rail Beer & Ale	USA
SAVEA	Save-a-lot Markets	USA
RATTC	Rattlesnake Canyon Grocery	USA
OLDWO	Old World Delicatessen	USA
LONEP	Lonesome Pine Restaurant	USA
LETSS	Let's Stop N Shop	USA
LAZYK	Lazy K Kountry Store	USA
HUNGC	Hungry Coyote Import Store	USA
GREAL	Great Lakes Food Market	USA

源代码：

void  Page_Load( object  sender, System.EventArgs e)
             {
                string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionSqlServer"];
                string Sql = "SELECT CustomerID, CompanyName, Country FROM Customers";

                SqlConnection thisConnection = new SqlConnection(ConnectionString);
                SqlDataAdapter adapter = new SqlDataAdapter(Sql, thisConnection);

                // 创建DataTable对象
                DataTable table = new DataTable();

                // 填充数据到DataTable
                adapter.Fill(table);

                // 创建DataView，并在构造函数中得到排序和检索条件等参数
                DataView dataView = new DataView(table, "Country='USA'", "CompanyName DESC", DataViewRowState.CurrentRows);

                // 数据绑定
                myDataGrid.DataSource = dataView;
                myDataGrid.DataBind();
            }