OLEDBEException(0x80004005):未指定错误?

我创建了一个按钮( Next CHAPTERS ;

我的问题是这个按钮可以工作两次,有时甚至三次。之后我得到了[NotSpecified error]。

Dim S As Integer = Integer.Parse(Request.QueryString("id"))
Dim RQ As String
Dim DR As OleDbDataReader
RQ = "SELECT ID_C FROM CHAPTRES"
DR = Connexion.lecture(RQ)
While DR.Read
    If DR.GetInt32(0) = S Then
            Exit While
        End If
    End While

    If DR.Read = True Then
        S = DR.GetInt32(0)
        Response.Redirect("Chapitre.aspx?id=" & S)
    Else   
        // End of records (stop reading)
    End If

谢谢。

UPDATES :

这就是 connecter lecture 功能在我的 Connexion.vb 文件:

Imports Microsoft.VisualBasic
Imports System.Data
Imports System.Data.OleDb
Imports System.Data.SqlClient

Public Class Connexion

Public Shared Function conecter() As OleDbConnection
    Dim MyConnexion As OleDbConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & System.AppDomain.CurrentDomain.BaseDirectory & "/Learning.mdb")
    MyConnexion.Open()
    Return MyConnexion
End Function

Public Shared Function lecture(ByVal requete As String) As OleDbDataReader
    Dim Mycommand As OleDbCommand = conecter().CreateCommand()
    Mycommand.CommandText = requete
    Dim myReader As OleDbDataReader = Mycommand.ExecuteReader()
    Return myReader

End Function