<tr>
<td style="width:160px;text-align:center;font-weight:bold; height: 240px;">留言内容</td>
<td style="width:310px;text-align:left; height: 240px;">
<asp:TextBox ID="TextBox2" runat="server" Height="228px" Width="321px" TextMode="MultiLine"></asp:TextBox></td>
</tr>
<tr>
<td colspan="2" style="height:20px;" align="center">
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ErrorMessage="*内容请不要少于4个字符多于200个字符" ControlToValidate="TextBox2" ValidationExpression=".{4,200}" Font-Size="Small"></asp:RegularExpressionValidator></td>
</tr>这样写 .{4,200} 好像不行,空格和换行占了位置
该怎样解决呢?
如果需要验证不为空则还需加RequiredFieldValidator