窗体中连接ACCESS数据库的写法？

1、string databasestr="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db.mdb";
   string databasesql="select * from t1";
   OleDbConnection databaseconn=new OleDbConnection();
   databaseconn.ConnectionString=databasestr;
   OleDbDataAdapter da=new OleDbDataAdapter(databasesql,databaseconn);
   DataSet ds=new DataSet();
   da.Fill(ds,"t1");
   dataGrid1.SetDataBinding(ds,"t1");