ช่วยดูให้หน่อยครับว่า ExecuteReader requires ... มันคืออะไรแก้ยังไง VB2008

Dim objConn As System.Data.OleDb.OleDbConnection
Dim objCmd As System.Data.OleDb.OleDbCommand
Dim strConnString As String
strConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="&Server.MapPath("database/mydatabase.mdb")&";Jet OLEDB:Database Password=;"
objConn = New System.Data.OleDb.OleDbConnection(strConnString)
objConn.Open()

Dim strSQL As String
strSQL = "SELECT * FROM customer"

Dim dtReader As System.Data.OleDb.OleDbDataReader
objCmd = New System.Data.OleDb.OleDbCommand(strSQL, objConn)
dtReader = objCmd.ExecuteReader()

'*** DataReader ***'

dtReader.Close()
dtReader = Nothing
objConn.Close()
objConn = Nothing