Linq ExecuteQuery，ExecuteCommand

//连接语句
public readonly string sqlconn = ConfigurationManager.ConnectionStrings["Transaction_9_30ConnectionString"].ConnectionString;

//ExecuteQuery

LinqToSqlDataContext LinqToSql = new LinqToSqlDataContext(sqlconn);
            //var result = from query in LinqToSql.Class select query;
            List<Class> result = LinqToSql.ExecuteQuery<Class>("select * from Class").ToList();
            dataGridView1.DataSource = result;

//ExecuteCommand

string StringText = textBox1.Text;
            linq.ExecuteCommand("update Class set ClassName={0} where ClassID='5'", StringText);
            IEnumerable<Class> sell = linq.ExecuteQuery<Class>("select * from Class").ToList();
            dataGridView2.DataSource = sell;