MVC concept help - change inline code to method

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C#

MVC

MVC Newbie.
After an edit I want to save the changes and then update an image to be stored in a different class.

I have now debugged the inline code and realize I will need it in another controller. So how do I turn it into a method? Where do I put it (create a folder[mymethods]? There is probably some preferred place to keep these custom methods. In my VB days I would write this as a function or subroutine, now I see this as some type of action result. I've seen a list of several, would this be a fileresult()?

       [HttpPost]
       [ValidateAntiForgeryToken]
       public ActionResult Edit(Task task)
       {
           if (ModelState.IsValid)
           {
               db.Entry(task).State = EntityState.Modified;
               db.SaveChanges();

// now create a new graph using the returned viewbag data
               var Mytopleft = 0;
               var Mytext = "";
               Bitmap mybmp = new Bitmap(10, 400);
               Graphics g = Graphics.FromImage(mybmp);
               // draw comma-delimited elements in multiple colors
               string[] chunks = Mytext.Split(',');
               var brush = new SolidBrush(Color.Black);
               SolidBrush[] brushes = new SolidBrush[]
                   {   new SolidBrush(Color.OldLace),
                       new SolidBrush(Color.LightSlateGray),
                       new SolidBrush(Color.LightBlue),
                       new SolidBrush(Color.LightGreen)
                   };
               int c = 0;
               foreach (var titem in ViewBag.Task)
               {
                   if (titem.SStart == null)
                   { c = 0; }
                   else if (titem.SStart != null && titem.SEnd == null)
                   { c = 1; }
                   else if (titem.SEnd != null && titem.SCert == null)
                   { c = 2; }
                   else if (titem.SCert != null)
                   { c = 3; }
   // create a new rectangle displaced by offset and with color
                   g.FillRectangle(brushes[c], Mytopleft, 0, 10, 10);
                   Mytopleft += 10;
               }
    //write to file   !!!!!!!!!!!!cannot write to root dir add \temp folder
                  mybmp.Save("C:\\temp\\lot1.bmp", System.Drawing.Imaging.ImageFormat.Gif);

               return RedirectToAction("Index");
           }
           ViewBag.BuilderID = new SelectList(db.Builders, "BuilderID", "BName", task.BuilderID);
           ViewBag.LotID = new SelectList(db.Lots, "LotID", "LotName", task.LotID);
           return View(task);
       }

Later I will write the bitmap into a db field.

So I create a method, something like Makegraph(Viewbag). Would I call it with a public FileResult makegraph(ViewBag)? Will I need to add a reference in the controller? Does it return(image)?


And most important where can I learn about this? MSDN doesn't seem to have meaningful examples.

Thank goodness for CODEPROJECT. and STACKOVERFLOW