Resource Cannot Be Found Error on Using "HttpPost" in Controller - asp.net-mvc

Question

Hello Am Working on a ASP.Net MVC 3 project and am getting a error called "Resource cannot be found" My situation is i have
1: am Using my own views and returning them in actions for instance i created a view manually first called "Create.cshtml" and manually added it to a action like this
[HttpPost]
Public ActionResult CreateStudent(StudentIfo studentinfo)
{
db.StudentInfo.add(studentinfo);
db.SaveChanges();
Return View("~/Views/Student/Create.cshtml");
}
[HttpGet] Before this Action works good but why Not HttpPost???
My Route Map says:
routes.MapRoute(" ",
"{controller}/{action}/{id}",
new { controller = "Student", action = "CreateStudent", id = UrlParameter.Optional }
);
2: Whenever i write [HttpPost] i get this Error and if I remove it then everything works good if such thing continues then how to save the data??
3: My Create.cshtml has a #Html.BeginForm("CreateStudent","Student",FormMethod.Post) am not getting what the issue is?? i have searched a lot but not getting a good answer.
4: What is best way for CURD operation when we are using our own views rather using Visual studios Scaffolding templates i.e am I going in right way?? i want my own views and then write my controllers according to them not as that of Visual Studio way first write controller then right click "Add-View"
Please recommend some good ways or any site or tutorials regarding it.

Answer 1

In short you will need both, you need a [HttpGet] action to return the initial form that the user can enter values into and then a [HttpPost] version to do the persistence. From this [HttpPost] method you should then RedirectToAction (return RedirectToAction(...)) to ensure that reloading of the page does not re-run the post operation.
So:
[HttpGet]
public ActionResult CreateStudent()
{
var viewModel = new CreateStudentViewModel { /* Set properties here or load data for it */ };
return View(viewModel);
}
[HttpPost]
public ActionResult CreateStudent(PostedValues values)
{
if (ModelState.IsValid)
{
// Create Student Here
return RedirectToAction(/* Jump to a logical place with a Get */)
}
/* Initialize correct error viewModel again and show the create student screen with validation errors */
return View(viewModel)
}
Personally I name these methods GetCreateStudent and PostCreateStudent and add two routes with a route constraint that limits the Http Method (see here)