true if the validation control can perform client-side validation; otherwise, false.
The BaseValidator.DetermineRenderUplevel method is a helper function that is used primarily by the BaseValidator.RenderUplevel property to determine whether the client's browser supports client script. For this property to return true, the following conditions must be true:
The browser has client script enabled.
The System.Web.HttpBrowserCapabilitiesBase.W3CDomVersion property of the System.Web.HttpBrowserCapabilitiesBase object that is stored in the System.Web.HttpRequest.Browser property is 1 or later.
The System.Web.Configuration.HttpCapabilitiesBase.EcmaScriptVersion property of the System.Web.HttpBrowserCapabilitiesBase object that is stored in the System.Web.HttpRequest.Browser property is 1.2 or later.