ASP.NET C# code to stream a download from a SQL server Filestream

General information for the website: A file sharing website
Kind of development: Customization of existing website
Num. of web pages/modules: 1
Description of every page/module: The code below is designed to allow me to download a file from a SQL database using ASP.NET.

I need the following code modified to allow me to download huge files (larger than 2GB) using a browser. At present I am getting an out of memory error message, which I think is because the byte array can only hold items up to 2GB and possibly because I am using visual studio instead of a full blown IIS. I need the code changed to stream the information from the SQL server, not copy it into a byte array and then return that.

I will need comments added to your code so I can change it for future use.


public FileContentResult VideoSingle()
{
Debug.WriteLine("Controller started");

string filename = "TheFileNameOfTheFile";
byte[] btImage = null;
string customer = "A10000001VICKERS.dbo.VIDEOS";
string idVideo = "16663406-9594-409D-93C5-85BB1AAB0B0D";
string sqlParameters = String.Format(@"SELECT filestreamvideo FROM {0} where idvideo=@VideoID", customer);
string connectionString = ConfigurationManager.ConnectionStrings["ConnectToSQL"].ConnectionString;

using (SqlConnection sqlConnection = new SqlConnection(connectionString))
{
using (SqlCommand sqlCommand = new SqlCommand(sqlParameters, sqlConnection))
{
sqlCommand.Parameters.AddWithValue("@VideoID", idVideo);
sqlConnection.Open();
SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();

if (sqlDataReader.Read())
{
btImage = (byte[])sqlDataReader["filestreamvideo"];
}
}
sqlConnection.Close();
}
return File(btImage, "mp4", filename + ".mp4");

}
Description of requirements/features: Create a asp.net controller to return a SQL Filestream as a file download that can deal with files larger than 2GB (potentially up to 16GB)
Specific technologies required: C# ASP.NET SQL
Extra notes: