vb.net 连 pl/sql 存储过程有关问题

vb.net 连 pl/sql 存储过程问题
这段代码连sqlserver数据库没问题,连oracle数据库存储过程不成功,求解

VB.NET code

        Dim myconnection As OracleConnection        Dim strsql = "User ID=card;Password=card;Data Source=orcltest"        myconnection = New OracleConnection(strsql)        myconnection.Open()        Dim oraclecomm As OracleCommand = Nothing        oraclecomm = New OracleCommand("trans", myconnection)        oraclecomm.CommandType = CommandType.StoredProcedure        oraclecomm.Parameters.Add("cardno", OracleType.VarChar)        oraclecomm.Parameters("cardno").Value = "889900"        Dim da1 As New OracleDataAdapter()        da1.SelectCommand = oraclecomm        Dim ds As New DataTable()        da1.Fill(ds)