How does the ASP.NET MVC UpdateModel() method work?

Question

I\'m working on my first .NET MVC application and using the NerdDinner tutorial as a reference point. One point that is intriguing me at the moment is the UpdateModel(

Answer 1

Instead of passing Model object as a parameter to "Post()" action method, we are creating an instance of an Model object within the "Post()" function, and updating it using "UpdateModel()" function. "UpdateModel()" function inspects all the HttpRequest inputs such as posted Form data, QueryString, Cookies and Server variables and populate the employee object.

e.g.

[HttpPost]
[ActionName("Create")]
public ActionResult Create_Post()
{
        EmployeeBusinessLayer employeeBusinessLayer =
            new EmployeeBusinessLayer();
        Employee employee = new Employee();
        UpdateModel(employee);
        employeeBusinessLayer.AddEmmployee(employee);
        return RedirectToAction("Index");
}