Compound primary key edit view MVC - asp.net-mvc

Question

Hi I'm trying to edit a Students grade in a linker table that contains the Student Id and the Course Id. I've looked around a bit, and have seen that I need to take in two id parameters into the view rather than just the one id, and then change the action link to take two parameters. But when i click on the edit button in the index, I get a 404 saying the page can't be found. Any ideas where I'm going wrong?
Thanks in advance.
Here's my index view
#model IEnumerable<S00132671CA2.Models.StudentCourse>
#{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<p>
#Html.ActionLink("Create New", "Create")
</p>
<table>
<tr>
<th>
#Html.DisplayNameFor(model => model.Grade)
</th>
<th></th>
</tr>
#foreach (var item in Model) {
<tr>
<td>
#Html.DisplayFor(modelItem => item.Grade)
</td>
<td>
#Html.ActionLink("Edit", "Edit", new { id= item.StudentId, CourseId = item.CourseId }) |
#Html.ActionLink("Details", "Details", new { id = item.StudentId, Course = item.CourseId }) |
#Html.ActionLink("Delete", "Delete", new { /* id=item.PrimaryKey */ })
</td>
</tr>
}
</table>
Here's my Edit action
public ActionResult Edit(int? StudentId, int? CourseId)
{
StudentCourse courseList = db.StudentCourse.Find(StudentId, CourseId);
if (courseList == null)
{
return HttpNotFound();
}
ViewBag.StudentId = new SelectList(db.Students, "StudentId", "StudentName", courseList.StudentId);
ViewBag.CourseId = new SelectList(db.Courses, "CourseId", "CourseName", courseList.CourseId);
return View(courseList);
}
Here's my model if it's any help
public class StudentCourse
{
[Key, Column(Order = 0)]
public int StudentId { get; set; }
public virtual Student Student { get; set; }
[Key, Column(Order = 1)]
public int CourseId { get; set; }
public virtual Course Course { get; set; }
public double Grade { get; set; }
}

Answer 1

Try
#Html.ActionLink("Edit", "Edit", new { StudentId = item.StudentId, CourseId = item.CourseId })