You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You derive a new validation control from the BaseValidator class. 
The validation logic for the control is implemented in the Validate method in the following manner：  
protected static bool Validate（string value）  
{  
// ...  
}   
You need to override the method that validates the value of the related control. 
Which override method should you use？（）

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a custom control named OrderForm. You write the following code segment：  
public delegate void CheckOrderFormEventHandler（EventArgs e）； private static readonly object CheckOrderFormKey = new object（）；  
public event CheckOrderFormEventHandler CheckOrderForm  
{  
add { Events.AddHandler（CheckOrderFormKey， value）； } 
remove { Events.RemoveHandler（CheckOrderFormKey， value）； } 
}   
You need to provide a method that enables the OrderForm control to raise the CheckOrderForm event. 
Which code segment should you use？（）