asp.net 验证控件

<asp:TextBoxrunat="server"ID="txtShortDesc"TextMode="MultiLine"/>

<asp:RequiredFieldValidatorrunat="server"ID="valShortDesc"ErrorMessage="must type"CssClass="dnnFormMessage dnnFormError dnnRequired"ControlToValidate="txtShortDesc"Display="Dynamic"/>

<asp:RegularExpressionValidatorID="valShortL"runat="server"ErrorMessage="too long" Display="Dynamic" ssClass="dnnFormMessage dnnFormError dnnRequired"ControlToValidate="txtShortDesc"ValidationExpression="^[A-z\d]{1,150}$"></asp:RegularExpressionValidator>