在窗体上画一个名称为Text1的文本框，要求文本框只能接收大写字母的输入。以下能实现该操作的事件过程是( )。
A．Private Sub Text1_KeyPress(KeyAscii As Integer)
If KeyAscii＜65 Or KeyAscii＞90 Then
MsgBox"请输入大写字母"
KeyAscii=0
End If
End Sub
B．Private Sub Text1_KeyDown(KeyCode As Integer,Shift As Integer)
If KeyCode＜65 Or KeyCode＞90 Then
MsgBox"请输入大写字母“
KeyCode=0
End If
End Sub
C．Private Sub Text1_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single)
If Asc(Text1.Text)＜65 Or Asc(Text1.Text)＞90 Then
MsgBox"请输入大写字母"
End If
End Sub
D．Private Sub Text1_Change()
If Asc(Text1.Text)＞64 And Asc(Text1.Text)＜91 Then
MsgBox"请输入大写字母"
End If
End Sub