[VB.NET]上一筆、下一筆問題

[wcf1023 (BLACK)]

下面是我的程式碼


Private Sub bt3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles bt3.Click


Dim bm As BindingManagerBase
bm = Me.BindingContext(ds, "player")
bm.Position = bm.Position + 1
da.Fill(ds, "player")
'資料往下一筆移動

End Sub
Private Sub bt4_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles bt4.Click


Dim bm As BindingManagerBase
bm = Me.BindingContext(ds, "player")
bm.Position = bm.Position - 1
da.Fill(ds, "player")
If bm.Position = bm.Position Then

End If
'資料往上一筆移動

End Sub

Ｑuestions：
１。我想在上一筆到頂的時候出現視窗說這已經到資料頂端了
２。我想在下一筆到底的時候出現視窗說這已經到資料底端了

謝謝！！

--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 123.193.89.189
→ wcf1023:對了~我是用2003版的