MVC File upload Where to put code - asp.net-mvc

Question

OK, so I am trying to make the move to MVC.
I have a Model, view and Controller made, but now I want to change the create functionality of the app.
I am working with uploads and I have this system generated code in my contoller.
Function Create(<Bind(Include:="Id,Course,Category,SubCategory,FileName,FileType,UploadedBy,DateUploaded")> ByVal acAsset As acAsset) As ActionResult
If ModelState.IsValid Then
db.Assets.Add(acAsset)
db.SaveChanges()
Return RedirectToAction("Index")
End If
Return View(acAsset)
End Function
Now I want to change this so that it will
Check for the existence of a folder for Course, Category and Sub category. If this folder is not there it must be created.
Upload the file select by a file selection box.
Post the files' name to the db.
The code is not necessarily the issue, I am jut not sure where I should put in the controller?
I have read this article but is not dealing with the DB post.
Thank you in advance.

Answer 1

You just add your code in controller that you want to hit on button click
Your Razor View Code
#using (Html.BeginForm("Upload", "Upload", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<input type="file" name="file" />
<input type="submit" name="Submit" id="Submit" value="Upload" />
}
C# Code
[HttpPost]
public ActionResult Upload(HttpPostedFileBase file)
{
if (file != null && file.ContentLength > 0)
{
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath("~/Images/"), fileName);
file.SaveAs(path);
}
return RedirectToAction("UploadDocument");
}
}

Answer 2

In your View
<input type="file" name="file">
In your Controller
public actionresult(HttpPostedFileBase file)
{
string filename = Path.GetFileName(file.FileName);
string contentType = file.ContentType;
using (Stream fs = file.InputStream)
{
using (BinaryReader br = new BinaryReader(fs))
{
byte[] bytes = br.ReadBytes((Int32)fs.Length);
}
}
//Data Context Code here
tableName.File= bytes;
db.add(tableName);
db.SaveChanges();
}