'System.Web.HttpPostedFileBase' does not contain a definition for 'HasFile' and no extension method 'HasFile' - asp.net-mvc-3

Question

I am following http://www.mikesdotnetting.com/Article/125/ASP.NET-MVC-Uploading-and-Downloading-Files. Using VS2010, ASP.NET 4.0, MVC3 in C# with ADO.NET in SQL Server 2008R2. I am getting the following error message...
'System.Web.HttpPostedFileBase' does not contain a definition for 'HasFile' and no extension method 'HasFile' accepting a first argument of type 'System.Web.HttpPostedFileBase' could be found (are you missing a using directive or an assembly reference?)
I searched through Stackflow, there was something about including System.Web.Abstractions. I included this and I still getting the error.
Thanks in advance if anyone can tell me the solution.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.IO;
using System.Data.SqlClient;
using System.Web.Helpers;
namespace MvcApplication1.Controllers
{
public class MyController : Controller
{
//
// GET: /My/
public ActionResult Index()
{
foreach (string upload in Request.Files)
{
if (!Request.Files[upload].HasFile()) continue;
string mimeType = Request.Files[upload].ContentType;
Stream fileStream = Request.Files[upload].InputStream;
string fileName = Path.GetFileName(Request.Files[upload].FileName);
int fileLength = Request.Files[upload].ContentLength;
byte[] fileData = new byte[fileLength];
fileStream.Read(fileData, 0, fileLength);
const string connect = #"Server=.\SQLExpress;Database=FileTest;Trusted_Connection=True;";
using (var conn = new SqlConnection(connect))
{
var qry = "INSERT INTO FileStore (FileContent, MimeType, FileName) VALUES (#FileContent, #MimeType, #FileName)";
var cmd = new SqlCommand(qry, conn);
cmd.Parameters.AddWithValue("#FileContent", fileData);
cmd.Parameters.AddWithValue("#MimeType", mimeType);
cmd.Parameters.AddWithValue("#FileName", fileName);
conn.Open();
cmd.ExecuteNonQuery();
}
}
return View();
}
public FileContentResult GetFile(int id)
{
SqlDataReader rdr; byte[] fileContent = null;
string mimeType = ""; string fileName = "";
const string connect = #"Server=.\SQLExpress;Database=FileTest;Trusted_Connection=True;";
using (var conn = new SqlConnection(connect))
{
var qry = "SELECT FileContent, MimeType, FileName FROM FileStore WHERE ID = #ID";
var cmd = new SqlCommand(qry, conn);
cmd.Parameters.AddWithValue("#ID", id);
conn.Open();
rdr = cmd.ExecuteReader();
if (rdr.HasRows)
{
rdr.Read();
fileContent = (byte[])rdr["FileContent"];
mimeType = rdr["MimeType"].ToString();
fileName = rdr["FileName"].ToString();
}
}
return File(fileContent, mimeType, fileName);
}
}
}
in the Helpers folder I have the Helper class.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace MvcApplication1.Models
{
public static class Helper
{
public static bool HasFile(this HttpPostedFileBase file)
{
return (file != null && file.ContentLength > 0) ? true : false;
}
}

Answer 1

You need to add a using statement to your MyController code file, as that is what is required when you want to use an extension method (it needs to be in scope):
using MvcApplication1.Models;