ScriptManager, Alert, Alertify, and Confirmation in ASP.NET + JavaScript

When you’re building ASP.NET WebForms applications, showing feedback messages to users is crucial. You may use:

• JavaScript’s built-in dialogs (alert, confirm)

• Third-party libraries (like alertify.js)

• ASP.NET’s ScriptManager.RegisterStartupScript to trigger these scripts after server-side operations.

Let’s break this down step by step.