MVC4 CRUD with ASPX view Engine & Entity Framework

Question

I wanted to do CRUD (create,Retrieve,Update and Delete) operations using 

ASP.Net MVC 4 with ASPX view engine & Entity framework(.edmx file extension)

 

I wrote for Showing the data and Inserting it to the Database.

 

Please tell me how to do it for Update and Delete operations

 

NorthwindEntities obj = new NorthwindEntities();

public ActionResult Cateview()

{

ViewData["Cate"]=obj.Categories.ToList();

return View();

}

public ActionResult InsertCateview()

{

return View();

}

[HttpPost]

public ActionResult InsertCateview([Bind] Category objcate)

{

obj.Categories.Add(objcate);

obj.SaveChanges();

return RedirectToAction("Cateview", "Cate");

}