如何在调用oracle中的存储过程，并取得输出参数(100分)

代码如下：不知怎样继续
Imports System.Data
Imports System.Data.OracleClient

conn()‘连接数据库
command.Connection = oracleconn
command.CommandType = CommandType.StoredProcedure
command.CommandText = "dsp_yy_new_judge_adslnet"
command.Parameters.Add(New OracleParameter("i_district_no", OracleType.VarChar, 20)).Value = district
command.Parameters.Add(New OracleParameter("i_user_num", OracleType.VarChar, 20)).Value = usernum
command.Parameters.Add(New OracleParameter("i_name", OracleType.VarChar, 20)).Value = username
command.Parameters.Add(New OracleParameter("i_id_number", OracleType.VarChar, 20)).Value = idnumber
Dim oresult1 As New OracleParameter("o_result", OracleType.VarChar, 200)
command.Parameters.Add(oresult1).Direction = ParameterDirection.Output