Imports System.Data.OleDb
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim connetionString As String
        Dim connection As OleDbConnection
        Dim oledbAdapter As OleDbDataAdapter
        Dim ds As New DataSet
        Dim firstSql As String
        Dim secondSql As String
        Dim i As Integer
        connetionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Your mdb filename;"
        firstSql = "Your First SQL Statement Here"
        secondSql = "Your Second SQL Statement Here"
        connection = New OleDbConnection(connetionString)
        Try
            connection.Open()
            oledbAdapter = New OleDbDataAdapter(firstSql, connection)
            oledbAdapter.Fill(ds, "First Table")
            oledbAdapter.SelectCommand.CommandText = secondSql
            oledbAdapter.Fill(ds, "Second Table")
            oledbAdapter.Dispose()
            connection.Close()
            'retrieve first table data
            For i = 0 To ds.Tables(0).Rows.Count - 1
                MsgBox(ds.Tables(0).Rows(i).Item(0) & "  --  " & ds.Tables(0).Rows(i).Item(1))
            Next
            'retrieve second table data
            For i = 0 To ds.Tables(1).Rows.Count - 1
                MsgBox(ds.Tables(1).Rows(i).Item(0) & "  --  " & ds.Tables(1).Rows(i).Item(1))
            Next
        Catch ex As Exception
            MsgBox("Can not open connection ! ")
        End Try
    End Sub
End Class