[VB.NET]Oracle.DataAccess 连Oracle怎么老出错,try catch 打印出来的错误信息是

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Oracle.DataAccess 连Oracle怎么老出错,try catch 打印出来的错误信息是"空"......
Try
Dim ora As OracleConnection
ora = New OracleConnection( "Data Source=data;User ID=test;Password=test ")
ora.Open()
Catch ex As System.Exception
MsgBox(ex.Message)
End Try


用下面这种方法连就可以连:
Try
dim m_con As Data.OracleClient.OracleConnection
m_con = New Data.OracleClient.OracleConnection( "Data Source=data;User ID=test;Password=test ")
m_con.Open()
Catch ex As System.Exception
MsgBox(ex.Message)
Exit Function
End Try

这是怎么回事啊,同样的连接语句,用Oracle.DataAccess怎么就连不上呢.....
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不知道为什么。
我是用后面的方法做
嘿嘿
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真是怪事.......
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引用了“System.Data.OracleClient”，并“Imports System.Data.OracleClient”后再试试看。
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