Error when use of fckeditor in asp,net

See more:

ASP.NET2

I TAKE ONE FCKEDITOR IF I USE EDITOR CONTENT AND SUBMIT DATA ITS RETURN BELOW ERROR
How can i resolve it?

Server Error in '/site' Application.
A potentially dangerous Request.Form value was detected from the client (fck_Edit="<img src="/FactoryX....").
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 (fck_Edit="
Source Error:


[No relevant source lines]