如何使用visual basic在access数据库中添加next和previous按钮？

Question

我使用了movePrevious（）方法和moveNext（）方法，但是一旦搜索完数据库，这种方法就不起作用了。我的意思是当我第一次加载表单时，事情工作正常，但在我搜索某个值后，然后尝试使用按钮它死了不起作用。请记住，我只是Visual Basic的初学者。

Private Sub EmployeeBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs)
    Me.Validate()
    Me.EmployeeBindingSource.EndEdit()
    Me.TableAdapterManager.UpdateAll(Me.CEMPLOYEEDataSet)
End Sub

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

End Sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    Me.Close()
End Sub

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Try
        Me.EmployeeTableAdapter.emp_id(Me.CEMPLOYEEDataSet.Employee, New System.Nullable(Of Integer)(CType(TextBox1.Text, Integer)))
    Catch ex As System.Exception
        System.Windows.Forms.MessageBox.Show(ex.Message)
    End Try
End Sub


Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
    EmployeeBindingSource.MovePrevious()
End Sub

Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
    EmployeeBindingSource.MoveNext()
End Sub

我的表格图片