OleDbDataAdapter 更新Access数据库问题困扰啊

为了更新数据库，做了个测试窗体就两个按钮（显示和更新数据），一个DataGridView1，一个DataSet1，一个OleDbConnection1（连接已经设置），一个OleDbDataAdapter1（SelectCommand已经设置，updatecmd，delcmd等已经自动生成，但发现有问题，里面有很多问号，是怎么回事啊），一个OleDbCommandBuilder1-----------------------------------------------------显示按钮事件代码（可以正常显示数据）： Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Me.OleDbCommandBuilder1.DataAdapter = Me.OleDbDataAdapter1 Me.OleDbDataAdapter1.Fill(Me.DataSet1, "table") Me.DataGridView1.DataSource = Me.DataSet1.Tables(0) End Sub--------------------------------------------------------更新数据按钮代码： Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Me.OleDbCommandBuilder1.DataAdapter = Me.OleDbDataAdapter1 Dim myCount As Integer = Me.OleDbDataAdapter1.Update(Me.DataSet1, "table") Me.DataGridView1.EndEdit() Me.DataSet1.Tables(0).AcceptChanges() M 收起