ASP.NET MVC Show div after validation

Answer 1

I can answer to your first question:

public ActionResult ContinueToCorr(string Number, string Rev)
{
    ViewData["DivIsVisible"] = true;
    return RedirectToAction("../Wizard/Index/1");
}

You are using RedirectToAction, that clears all ViewData. Instead, use:

public ActionResult ContinueToCorr(string Number, string Rev)
{
    ViewData["DivIsVisible"] = true;
    return Index(1);
}

I'm assuming that you have an ActionResult called Index that takes an Int parameter, in your Wizard controller.