Why can't I send the file?

Question

ASP.NET

The view has this form:

@using (Html.BeginForm("Upload", "Home", FormMethod.Post))
{
    <input type="file" name="1CClientBankExchange" accept="text/plain" required />
    <input type="submit" />
}

In the controller, this action:

[HttpPost]
public ActionResult Upload(HttpPostedFile file)

Why is it not called when I send it? It doesn't give any errors either... I tried it like this:

[HttpPost]
public ActionResult Upload()
{
      var file = Request.Files["1CClientBankExchange"];
}

It doesn't help either. What is the problem?
PS I don't know if routes are needed for POST requests? Now no. But the name of the controller and action in BeginForm is also indicated there. So I don't think it's necessary...
Hurrah! I figured it out. It turns out that routes for POST requests are still needed. :D And the type of the file HttpPostedFileWrapper and the name of the variable also seem to matter (as it should be in the form).

Answer 1

The example uses HttpPostedFileBase (there is some confusion about HttpPostedFile). Educational program on the topic of loading files in ASP.NET MVC.