The System.Web.HttpRequest class uses input validation flags to track whether to perform validation on the request collections accessed through the HttpRequest.Cookies, HttpRequest.Form, and HttpRequest.QueryString properties. The HttpRequest.ValidateInput method sets these flags so that when the get accessors for the HttpRequest.Cookies, HttpRequest.Form, or HttpRequest.QueryString property are invoked, input validation is performed. Validation works by checking all input data against a hard-coded list of potentially dangerous data.

If the validation feature is enabled by page directive or configuration, this method is called during the page's ProcessRequest processing phase. The HttpRequest.ValidateInput method can be called by your code if the validation feature is not enabled.

Namespace: System.Web
Assembly: System.Web (in System.Web.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0