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 初级入门的小例子。

首先确保引用了命名空间： 

using System.Data;
using System.Data.OracleClient;

定义连接字符串如下：

    private const string ConnectionString = "Data Source=mydatabase;user=name;password=pwd;";

 1.使用OracleCommand执行无参数简单查询，直接写SQL语句或调用存储过程，使用OracleDataReader遍历显示数据，如下：

    protected void GetData1()
    {           
        OracleConnection conn = new OracleConnection(ConnectionString);try
        {
            conn.Open();
            OracleCommand cmd = new OracleCommand();

            cmd.Connection 

= conn;
            //cmd.CommandText = "select * from TB";
            cmd.CommandText = "bowenpkg.getdata";
            cmd.CommandType = CommandType.StoredProcedure;

            OracleParameter parameters 

= new OracleParameter("refOut", OracleType.Cursor);
            parameters.Direction = ParameterDirection.Output;

            cmd.Parameters.Add(parameters);

            OracleDataReader odr 

= cmd.ExecuteReader();
            while (odr.Read())
            {
                Response.Write(odr.GetOracleString(1).ToString() + "<br>");
            }

            odr.Close();
        }

catch (Exception ee)
        {
            Response.Write(ee.Message);
        }
        finally
        {
            conn.Close();
        }
    }

 2.使用OracleDataAdapter执行SQL语句，填充DataSet，遍历显示数据，如下：

    protected void GetData2()
    {
        OracleConnection conn = new OracleConnection(ConnectionString);
        OracleDataAdapter ad = new OracleDataAdapter("select * from TB", conn);try
        {
            DataSet ds = new DataSet();
            ad.Fill(ds);foreach (DataRow dr in ds.Tables[0].Rows)
            {
                Response.Write(dr["code"].ToString() + "<br>");
            }
        }
        catch (Exception ee)
        {
            Response.Write(ee.Message);
        }
        finally
        {
            conn.Close();
        }
    }

 3.带参数的存储过程，如下：

    protected void ViewButton_Click(object sender, EventArgs e)
    {
        OracleConnection conn = new OracleConnection(ConnectionString);try
        {
            conn.Open();
            OracleCommand cmd = new OracleCommand();

            cmd.Connection 

= conn;
            cmd.CommandText = "bowenpkg.getdatabyid";
            cmd.CommandType = CommandType.StoredProcedure;

            OracleParameter[] parameters 

= {new OracleParameter("rid",OracleType.Number),new OracleParameter("refOut", OracleType.Cursor)};
            parameters[0].Direction = ParameterDirection.Input;
            parameters[0].Value = DropDownList1.SelectedValue;
            parameters[1].Direction = ParameterDirection.Output;

            cmd.Parameters.Add(parameters[

0]);
            cmd.Parameters.Add(parameters[1]);

            OracleDataAdapter da 

= new OracleDataAdapter(cmd);

            DataTable dt

=new DataTable();

            da.Fill(dt);

            Label1.Text 

= dt.Rows[0][1].ToString();
        }
        catch (Exception ee)
        {
            Response.Write(ee.Message);
        }
        finally
        {
            conn.Close();
        }
    }