Converting file to bytes then saving to SQL using C# MVC

Question

Good morning!

I was able to do this in asp.net but I am moving to MVC using C# and am stuck.

Here is my view:

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    <input type="file" id="bgFileUpload" name="bgFileUpload" />
<input type="submit" id="createNewBtn_id" name="submitNew" value="submitNew" />
}

and then I have this in my controller:

public ActionResult Admin(string submitNew)
       {
           uploadFileToSqlDb();
           return View();
       }

The above calls my function. Here is the function:

[HttpPost]
       public ActionResult uploadFileToSqlDb()
       {
           byte[] uploadedFile = new
           byte[Request.Files["bgFileUpload"].InputStream.Length];

           return View();
       }

But everytime I get a "Object reference not set to an instance of an object". Any suggestions for a noobie such as myself?

Everything I have seen online I appear to be doing incorrectly or possibly interpretting it wrong.