Linq to sql making multiple calls in asp.net mvc 3

When I am updating a record with linq to sql my DeleteLesson() method is getting called multiple times.

My controller looks like this :

    public ActionResult  Delete(int id)
    {

        deleteLesson(id);

        return Content("<p style=color:red><strong>Deleted...</strong></p>");
    }

    public void deleteLesson(int id)
    {
        LLDataContext storeDB = new LLDataContext();

            lesson lesson = (from l in storeDB.lessons
                             where l.lessonID == id
                             select l).Single();

            lesson.statusID = DELETED;
            lesson.dateDeleted = DateTime.Now;
            lesson.deletedByUserID = getAppUserID();

            try
            {
                storeDB.SubmitChanges();
            }
            catch (Exception e)
            {

                Console.WriteLine(e.Message);

                storeDB.SubmitChanges();
            }
    }

And my view looks like this

 @Ajax.ActionLink("Delete", "Delete", 
                                     new { id = item.lessonID }, 
                                     new AjaxOptions {  

                                  开发者_C百科                     HttpMethod = "POST",
                                                       UpdateTargetId = @rowNumber.ToString()
                                     }
                                    )

Any Ideas?

EDIT

also if I use confirm = "Do you want to delete" in ajax options I will have to click okay three times.

Are you getting both a post and a get call to it?
try making

public ActionResult  Delete(int id)

into

[HttpPost()]
public ActionResult  Delete(int id)

specific to http post IMO. Do you really want users browsing to /Lesson/Delete/5 and have it work anyway? I'd think you only want this to handle from a postback where you're displaying the lesson they're going to delete.