asp.net-mvc-3

Redirect back to Previous Page without losing original data

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I have trouble preserving the original data by redirecting the same page when my custom error handling is executed in the controller.
Assume that I have a web page call Create.cshtml.
In that create webpage, I have a few form control which require the user to enter class code but the class code cannot be duplicated.
Assume that the user entered a class code that is existed in the system, my system should redirect back to Create.cshtml and pass error message (E.g. ViewBag.error = “Class Code duplicated”) and simulatenously .
But my current implementation does not revert back the original content/data after redirect.

Adding your own HtmlHelper in ASP.NET MVC 3

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I am new to MVC and I am trying to create my own extension method so that I can add onto the html helpers that are available in my razor views. Html.DropDownListFor() lets you create a drop down list for any propery on your model. I would like to create a helper called Html.StateDropDownListFor() that does the exact same thing, except loads the drop down with all 50 US states. This way I don’t have to create a SelectList for every single state drop down that I create. What is the easiest way to do this? Right now I have this: