input type="text" maxlength="11" /这是控制最大输入字数至于不能少于11个字，需要在点击保存按钮时，通过.length来控制
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以下是只能输入数字和小数点，并且小数点只能输入一次
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Textbox1.KeyPress
If Char.IsDigit(e.KeyChar) or e.KeyChar = Chr(8) or e.KeyChar = "." Then
If e.KeyChar = "." And InStr(TextBox1.Text, ".") 0 Then
e.Handled = True
Else
e.Handled = False
End If
Else
e.Handled = True
End If
End Sub
Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
Dim s As String = TextBox1.Text
If Not ((Mid(s, Len(s), 1) = "0" And Mid(s, Len(s), 1) = "9") Or (Mid(s, Len(s), 1) = "A" And Mid(s, Len(s), 1) = "Z")) Then
s = Microsoft.VisualBasic.Left(s, Len(s) - 1)
TextBox1.Text = s
TextBox1.SelectionStart = Len(TextBox1.Text)
End If
End Sub