Page_ISvalid checks All the inputs in the page are legal, return to Boolean
An array formed by all validation controls in the current page in Page_Validators
Page_ValidationActive is a Boolean value indicating whether the verification function is executed, and the verification function is turned off to FALSE.
Isvalid This property verifies whether the client's input is legal.
ValidatorNable (VAL, Enable) This method uses a verification control as a pass parameter, starts or disabling the control to use the verification function, and work on the client
