Binding a DataGrid with an Oracle data table

datagrid|oracle| data tired, finally found how to bind the data table to the Dategrid method. But this time to make an empirical error, the beginning is to Google, looking for a long time did not find, and later found in the CSDN community. Oh, stupid ah. This is an Oracle version.

private void Button1_Click (object sender, System.EventArgs e)
{
String connectionstring= "Data source=sky;user=diamond;password=diamond;"; Write connection string
OracleConnection conn=new OracleConnection (ConnectionString); Create a new connection
OracleCommand cmd= New OracleCommand ("SELECT * from Etam_users", conn);
DataSet ds = new DataSet ();
OracleDataAdapter oda=new OracleDataAdapter ();
Oda. Selectcommand=cmd;
Oda. Fill (DS);
Conn. Close ();
Dg. Datasource=ds. Tables[0]. DefaultView;
}