Console.WriteLine("---使用SQL Server数据提供程序");
            string sqlConnection = @"Data Source=CYY-PC\SQLEXPRESS;Integrated Security=SSPI;Initial Catalog=mydb1;";
            string sqlSelect = "select * from person where age>=@Age";
            SqlConnection conn=new SqlConnection(sqlConnection);
            SqlCommand command = new SqlCommand(sqlSelect, conn);
            command.Parameters.Add("@Age", SqlDbType.Int);
            command.Parameters["@Age"].Value = 20;

            SqlDataAdapter adapter = new SqlDataAdapter(command);
            DataSet ds = new DataSet();
            adapter.FillSchema(ds, SchemaType.Source,"Schema");
            adapter.Fill(ds,"T");   
            foreach (DataRow row in ds.Tables["T"].Rows)
            {
                Console.WriteLine("ID={0},Name={1},Age={2}",row["ID"],row["name"],row["age"]);
            }

            Console.WriteLine("---使用OLE DB数据提供程序");
            string oledbConnectionString = @"Provider=SQLOLEDB;Data Source=CYY-PC\SQLEXPRESS;Integrated Security=SSPI;Intial Catalog=mydb1;";
            string oledbSelect = "Select * from person where age>=?";
            OleDbConnection oledbConn = new OleDbConnection(oledbConnectionString);
            OleDbCommand oledbCmd = new OleDbCommand(oledbSelect, oledbConn);
            oledbCmd.Parameters.Add("@Age", OleDbType.Currency);
            oledbCmd.Parameters["@Age"].Value = 20;
            OleDbDataAdapter oledbDa = new OleDbDataAdapter(oledbCmd);
            DataTable dt = new DataTable();
            oledbDa.Fill(dt);//运行时报错,“对象名 'person' 无效。”为什么？SQL Server提供程序没错，OLE DB提供程序出错。是否有什么要注意的？请教！
            foreach (DataRow row in dt.Rows)
            {
                Console.WriteLine("ID={0},Name={1},Age={2}", row["ID"], row["name"], row["age"]);
            }

这是书上的例子，连接字符串应该没有问题。怎么测试连接字符串是否有问题