MVC EF Insert bitmap into table

//   first   save the edit data  
Actionresult Edit (Lot Lot)   
{    remove scaffold code for clarity
db.SaveChanges();
// create a new image to replace image currently in db.  
Bitmap mybmp = new Bitmap(400, 20);  
Graphics g = Graphics.FromImage(mybmp);  
g.DrawRectangle(Pens.Black, 0, 0, 400, 20);  
SolidBrush b = new SolidBrush(Color.OldLace);  
g.FillRectangle(b, 0, 0, 400, 20);  
// write a test file to confirm this is ok   ------it works  
mybmp.Save("C:\\temp\\lot1.bmp",System.Drawing.Imaging.ImageFormat.Gif);

//  add code here to save image to Lot table field TaskImage  here
db.SaveChanges();
}

public class Lot
{
public int LotID { get; set; }
public byte?[] TaskImage { get; set; }
}