C#中调用类中定义的共用类中的方法

using System.Data.OracleClient;

DB_Conn dcon = new DB_Conn();
DataSet ds = new DataSet();

public Form2()
{
InitializeComponent();

//Soulation 1
//OracleConnection con = new OracleConnection();

//m_strConnection = "Data Source=LGETRKB.WORLD;" +
// "Persist Security Info=false;" +
// "Unicode=True;" +
// "User ID=oraknbn;" +
// "Password=rksvks2006";
//con.ConnectionString = m_strConnection;
//con.Open();
//OracleDataAdapter dt = new OracleDataAdapter("select * from tb_comp_lotid_mapping",con);
// DataSet ds = new DataSet();
//dt.Fill(ds);

//Soulation2
ds = dcon.ExceDS("select * from tb_comp_lotid_mapping");

dataGridView1.DataSource = ds.Tables[0];

}