JumpStart # 18– Deferred validation in ASP.Net 4.5 using requestValidationMode
In ASP.Net 4.5, we can defer (lazy) validation of form fields by setting requestValidationMode attribute in httpRuntime section of web.Config file. By default, all the data coming through in request is subjective for validation. But if we want to defer the validation for form fields until they are accessed at runtime, we can set requestValidationMode attribute along with ValidateRequestMode to disabled for the controls of our interest.