A potentially dangerous Request.Form value was detected from the client

Server Error in '/' Application.

---

A potentially dangerous Request.Form value was detected from the client (txtCode="<br/>").

Description: Request Validation has detected a potentially dangerous client input value, and processing of 

the request has been aborted. This value may indicate an attempt to compromise the security of your application, 

such as a cross-site scripting attack. To allow pages to override application request validation settings, set the 

requestValidationMode attribute in the httpRuntime configuration section to requestValidationMode="2.0". 

Example: <httpRuntime requestValidationMode="2.0" />. After setting this value, you can then disable request

validation by setting validateRequest="false" in the Page directive or in the <pages> configuration section. 

However, it is strongly recommended that your application explicitly check all inputs in this case. For more 

information, see http://go.microsoft.com/fwlink/?LinkId=153133. 

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form 

value was detected from the client (txtCode="<br/>").

You have to do little modification to you application to get this fixed. 

1. Add <httpRuntime requestValidationMode="2.0" /> in your application web.config

   under <system.web>.

   <system.web>

    <httpRuntime  requestValidationMode="2.0"/>

2. Add RequestValidation="false" on your page or in web.config <pages> 

   attribute.

<%@ Page Language="C#" AutoEventWireup="true" ValidateRequest = "false"

or

to work this for whole application do in web.config as:

<system.web>

    <httpRuntime  requestValidationMode="2.0"/>

    <pages validateRequest ="false"></pages>