您的代码中可能会遗漏两三件事。





在按钮和验证控件上添加验证组

add operator&比较Validator的type属性。



它将定义您想要比较的数据类型以及您想要比较的情况。

two or three things are missing in your code that you may try.


add validation group on button and validation control
add operator & type property for the compare Validator.

it will define that what datatype you want to compare and what case do you want to compare.

<asp:comparevalidator id="CompareValidator1" runat="server" enableclientscript="true" xmlns:asp="#unknown">
                       ControlToCompare="txthdnREsult" ControlToValidate="txtCaptcha"
                       ErrorMessage="Invalid Captcha Entered." Operator="Equal" Type="String" ValidationGroup="groupname"></asp:comparevalidator>