<p>I am attempting to update a project from ASP.NET MVC Preview 3 to Preview 5 and it seems that Controller.ReadFromRequest(string key) has been removed from the Controller class. Does anyone know of any alternatives to retrieving information based on an identifier from a form?</p>

Not sure where it went. You could roll your own extension though:
public static class MyBindingExtensions 
{
```
```
public static T ReadFromRequest < T > (this Controller controller, string key) 
{
    // Setup
    HttpContextBase context = controller.ControllerContext.HttpContext;
    object val = null;
    T result = default(T);

    // Gaurd
    if (context == null)
        return result; // no point checking request

    // Bind value (check form then query string)
    if (context.Request.Form[key] != null)
        val = context.Request.Form[key];
    if (val == null) 
    {
        if (context.Request.QueryString[key] != null)
            val = context.Request.QueryString[key];
    }

    // Cast value
    if (val != null)
        result = (t)val;

    return result;
}

}
```
```