不知这个错误是什么原因

[jinchun]

这段代码怎么会出错？？
string mySelectQuery = "SELECT cn_id,cn_n_parentid FROM tn_sys_product";
OleDbConnection myConnection = new OleDbConnection(System.Configuration.ConfigurationSettings.AppSettings["strConnection"].ToString());
OleDbCommand myCommand = new OleDbCommand(mySelectQuery,myConnection);
myConnection.Open();
OleDbDataReader myReader;
myReader = myCommand.ExecuteReader();
while (myReader.Read())
{
Response.Write( myReader.GetString(1));
}
myReader.Close();
myConnection.Close();



未指定的错误：E_FAIL(0x80004005)
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.Data.OleDb.OleDbException: 未指定的错误：E_FAIL(0x80004005)

源错误:


行 24： myConnection.Open();
行 25： OleDbDataReader myReader;
行 26： myReader = myCommand.ExecuteReader();
行 27： // Always call Read before accessing data.
行 28： while (myReader.Read())

[panyee]

SELECT cn_id,cn_n_parentid FROM tn_sys_product

看下是否正常执行

[guoyan19811021]

Dim mySelectQuery As String = "SELECT * FROM log"
Dim myConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\UserLog.mdb")

Dim myCommand As OleDbCommand = New OleDbCommand(mySelectQuery, myConnection)
myConnection.Open()
Dim myReader As OleDbDataReader
myReader = myCommand.ExecuteReader()
While (myReader.Read())
Response.Write(myReader.GetString(1))
End While



myReader.Close()