A potentially dangerous Request

Error:

A potentially dangerous Request.Form value was detected from the client (TextBox2="<html></html>").


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. You can disable request validation by setting validateRequest=false in the Page directive or in the

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

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (TextBox2="<html></html>").

Generally this type of error encountered when we trying request the form by entering html tags into the input fileds.

To resolve this problem
In page directive add the following attribute.

ValidateRequest="false"