在调用“填充”之前，尚未初始化SelectCommand属性-Visual Studio 2010

Question

Dim stSQL As String
stSQL = "SELECT BookingID, Customer, Seat FROM tblBookings"

Dim stConString As String
stConString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\GT\Documents\Visual Studio 2010\Projects\Online Movie Reservation System.accdb"

Dim conBookings As OleDbConnection
conBookings = New OleDbConnection
conBookings.ConnectionString = stConString
conBookings.Open()

Dim cmdSelectBookings As New OleDbCommand(stSQL, conBookings)

Dim dsBookings As New DataSet
Dim daBookings As New OleDbDataAdapter(cmdSelectBookings)

daBookings.Fill(dsBookings, "Bookings")
conBookings.Close()

MsgBox(dsBookings.Tables("Bookings").Rows.Count)

我想使用代码获取和查看表，这些表可用于在线预订系统脱机使用。使用Visual Studio 2010

谢谢