.NET
AOP run time AOP in .net: Castle Core [ pluralsight ] compile time AOP in .net: postsharp .net standard it can only be used to build class libraries ASP.NET Webform Custom Validator Asynchronous https://stackoverflow.com/questions/3982420/asp-net-custom-validator-webmethod-jquery FiddlerCore NET library that allows you to capture and modify HTTP and HTTPS traffic. Can be integrated into any .NET Framework and .NET Standard app or project. a paid product