在text文本框中只允许输入数字和小数点，如何实现？只能编程实现吗？

在keypress中进行判断，如果不合格就sendkeys(vb_backspace)
具体函数的参数我不太会写了，就是用sendkeys的 
　回复人：playyuer(女㊣爱)　(2001-5-8 13:09:00)  得0分
Private Sub Text1_KeyPress(KeyAscii As Integer)
  Select Case KeyAscii
      Case Asc("-") 允许负数
            If Text1.SelStart = 0 Then
              If Left(Text1.Text, 1) = "-" Then
                  KeyAscii = 0
                  Beep
              End If
            Else
              KeyAscii = 0
              Beep
            End If
        Case 8
              无变化,退格键不屏蔽
        Case Asc(" ") 32
            If Text1.SelLength = 0 Then
                KeyAscii = 0
            End If
        Case Asc(".") 46 允许小数点
            If InStr(Text1.Text, ".") Then
                KeyAscii = 0
            End If
        Case Is < Asc(0) 48
              KeyAscii = 0
        Case Is > Asc(9) 57
              KeyAscii = 0
  End Select
End Sub 

　回复人：liu_feng_fly(一只菜鸟，忽忽悠悠的就飞来了！！)