<AttributeUsageAttribute(ValidOn=AttributeTargets.Method, 
   AllowMultiple=True, 
   Inherited=True)>
Public Class BeforeSetAttribute 
   Inherits PropertyInterceptorAttribute
   Implements System.Runtime.InteropServices._Attribute 

Dim instance As BeforeSetAttribute

[AttributeUsageAttribute(ValidOn=AttributeTargets.Method, 
   AllowMultiple=true, 
   Inherited=true)]
public class BeforeSetAttribute : PropertyInterceptorAttribute, System.Runtime.InteropServices._Attribute  

[AttributeUsageAttribute(ValidOn=AttributeTargets.Method, 
   AllowMultiple=true, 
   Inherited=true)]
public ref class BeforeSetAttribute : public PropertyInterceptorAttribute, System.Runtime.InteropServices._Attribute  

public partial class Customer {

  // Sample signatures for a BeforeSet method for any Customer property
  // (invoked for both simple and navigation properties).
  // Additional signatures are possible.

  // Signature 1 - accept a property value and return a property value.
  // Any value returned is passed to next action.
  [BeforeSet]
  public object BeforeSetAnyCustomerProperty1(object value) {
    Console.WriteLine("Before setting a customer property 1");
    return value;
  }

  // Signature 2 - accept a property value, but no return value.
  [BeforeSet]
  public void BeforeSetAnyCustomerProperty2(object value) {
    Console.WriteLine("Before setting a customer property 2");
  }

  // Signature 3 - accept base IPropertyInterceptorArgs.
  // Allows you to cancel further actions and modify the Value.
  // No property information available.
  [BeforeSet]
  public void BeforeSetAnyCustomerProperty3(IPropertyInterceptorArgs args) {
    Console.WriteLine("Before setting a customer property 3");
  }

  // Signature 4 - accept EntityProperty interceptor arguments.
  // The arguments passed allow you to determine the property retrieved
  // and to cancel the set.  args.Value can be modified.
  // args.VerificationSetterOptions allows verification options to be set for all subsequent
  // actions within the setter.  Note that verification can be turned off also.
  [BeforeSet]
  public void BeforeSetAnyCustomerProperty4(IEntityPropertySetInterceptorArgs args) {
    Console.WriteLine("Before setting a customer property 4");
  }

  // Signature 5 - accept strongly-typed IPropertyInterceptorArgs.
  // Same features as IPropertyInterceptorArgs but Instance is now strongly-typed.
  [BeforeSet]
  public void BeforeSetAnyCustomerProperty5(IPropertyInterceptorArgs<Customer, object> args) {
    Console.WriteLine("Before setting a customer property 5");
  }
}