I need to know how to update and delete a record from the database. I know how to add a record but unable to update and delete a record to the database.
namespace Ex.Models
{
using System;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
public partial class MyEntities : DbContext
{
public MyEntities()
: base("name= MyEntities")
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}
public DbSet<Friend> Friend { get; set; }
}
}
--
The Controller
// POST: /Home/Edit/5
[HttpPost]
public ActionResult Edit(int id, Friend f)
{
try
{
// TODO: Add update logic here
myEntities.Friend.Attach(f);// Doesn't work.. How to update ?
myEntities.SaveChanges();
return RedirectToAction("Index");
}
catch
{
return View();
}
}
To add a record to the database, i used the following code. It worked;
myEntities.Friend.Add(f);
myEntities.SaveChanges();
return RedirectToAction("Index");
UPDATE
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<Exp.Models.Friend>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Delete
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<h2>Delete</h2>
<h3>Are you sure you want to delete?</h3>
<fieldset>
<legend>Friend</legend>
<div class="display-label">Name</div>
<div class="display-field">
<%: Html.DisplayFor(model => model.Name) %>
</div>
</fieldset>
<% using (Html.BeginForm()) { %>
<p>
<input type="submit" value="Delete" /> |
<%: Html.ActionLink("Back to List", "Index") %>
</p>
<% } %>
</asp:Content>
Delete
myEntities.Friend.Remove(f);
myEntities.SaveChanges();
Update
Friend f = myEntities.Friend.FirstOrDefault(x => x.Id = MyId);
f.Name = NewName;
myEntities.SaveChanges();
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