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Entity framework Context.SaveChanges not working at all

I'm having problems with this code. I´m able to connect to an mdf example database archive and generate the entity model. Althought I´m able to query the context model and retrieve information from the DB, when I try to update, delete or insert anything in the context and translate the changes to the DB Context.SaveChanges is not working. There is no Exception, the Entity model is updated properly, but the DB does not have the change.
Thanks in regard
public void addCourse(int courseId, int deptId, string courseTitle)
{
SchoolContexto = new SchoolEntities();
Course mycourse= new Course();
mycourse.CourseID = courseId;
mycourse.Credits = 10;
mycourse.DepartmentID = deptId;
mycourse.Title = courseTitle;
SchoolContexto.Courses.Add(mycourse);
SchoolContexto.SaveChanges();
SchoolContexto.Dispose();
}

Make property of .mdf file in your solution as
Copy to output Directory: "Copy only if newer"
Otherwise your db file will overwrite every time it runs

i suggest you to use this code :
public void addCourse(int courseId, int deptId, string courseTitle)
{
SchoolEntities entities = new SchoolEntities();
Course mycourse= new Course();
mycourse.CourseID = courseId;
mycourse.Credits = 10;
mycourse.DepartmentID = deptId;
mycourse.Title = courseTitle;
entities.Courses.Add(mycourse);
entities.SaveChanges();
}
if this is not working i suggest you to check your app.config file :)

Another way to add a new entity to the context is to change its state to Added. Have you tried this
using (var entities = new SchoolEntities())
{
Course mycourse= new Course();
mycourse.CourseID = courseId;
mycourse.Credits = 10;
mycourse.DepartmentID = deptId;
mycourse.Title = courseTitle;
context.Entry(mycourse).State = EntityState.Added;
entities.SaveChanges();
}

I think the Problem is that you working on localdb (.mdf) file .
I had the same problem but when i created new (sql server database connection)
Server name : (localdb)\MSSqlLocaldb .... it worked

A little off the subject but just in case you're here because you're performing an update and not an add, Check if you need a key on the table. I had a similar issue with EF Core. During an update on a table no error was generated but the SaveChanges returned 0. It wasn't until I tested adding a record, that it generated the key error. I resolved the key issue and the update went fine.

It happens because probably you don't have primary key in your Course entity.

I solved the problem by including the following namespace
using System.Data.SqlClient;

Saving an entity to the DB in WinForms

I've looked at so many posts about this, but still haven't found the solution:
I'm using a winforms app that uses EntityFramework (6?). When I load the form I can read from the DB using the context (Entities). However, when I savechanges after adding a new entity, it doesn't persist to the db.
var c = new Card { Name = tbName.Text, Quantity = int.Parse(tbQuantity.Text) };
dbContext.Cards.Add(c);
dbContext.SaveChanges();
The dbContext is setup in the form constructor and is an instance of "LiquorTrackEntities".
LiquorTrackEntities dbContext;
public Form1()
{
InitializeComponent();
dbContext = new LiquorTrackEntities()
Reading from the db works:
var cards = dbContext.Cards.ToList();
I do this stuff all the time in asp.net MVC, but it isn't working in WinForms.. is there something special I have to do in winforms? I also know about the normal "using (var db = new LiquorEntitiesEntities())" convention, but I just want to get this functioning before I worry about convention.
Any ideas?
Just tried this to no avail:
var c = new Card { Name = tbName.Text, Quantity = int.Parse(tbQuantity.Text) };
dbContext.Cards.Attach(c);
dbContext.Entry(c).State = EntityState.Added;
dbContext.SaveChanges();
Just tried creating a new EDMX using EF5 instead.. same problem.
UPDATE:
SaveChanges does return a 1 when after adding a card. It stays in the context (if I reload my cards from the context, the new one is there..) but never makes it to the database.

Entity Framework: adding existing child POCO to new Parent POCO, creates new child in DB

Im wanting to use Entity Framework POCO in a disconnected (from context) mode. In my scenario I'm creating a new Parent object and want to attach an existing child object to it and then save it to the db.
The code below undesirably inserts a new Course record when saving a new Student record, when instead I want the existing Course record linked to the new Student record.
How can I do this in Entity Framework where...
the objects can be disconnected from the context. (i.e. Queried in one context and then saved in a different context)
I dont need to re-query the child record from the DB just so I can attach it to the parent when I'm saving to db. I really want to avoid doing extra trips to the db when I already have it as an object in memory.
This page shows a database diagram that the code below is based on http://entityframeworktutorial.net/EF4_EnvSetup.aspx#.UPMZ4m-UN9Y
class Program
{
static void Main(string[] args)
{
//get existing course from db as disconnected object
var course = Program.getCourse();
//create new student
var stud = new Student();
stud.StudentName = "bob";
//assign existing course to the student
stud.Courses.Add(course);
//save student to db
using (SchoolDBEntities ctx = new SchoolDBEntities())
{
ctx.Students.AddObject(stud);
ctx.SaveChanges();
}
}
static Course getCourse()
{
Course returnCourse = null;
using (var ctx = new SchoolDBEntities())
{
ctx.ContextOptions.LazyLoadingEnabled = false;
returnCourse = (from s in ctx.Courses
select s).SingleOrDefault();
}
return returnCourse;
}
}

I believe there are few ways of accomplishing this.
You can specify that course entity is unchanged rather than added, along these lines:
ctx.Entry(course).State = EntityState.Unchanged;
Or instruct your context, that you are working with existing entity:
ctx.Courses.Attach(course);
More info here:
http://msdn.microsoft.com/en-us/data/jj592676.aspx
EDIT
There are some running samples from my solution, I verified they work as expected.
In all cases we have Publisher record in database with ID = 2 and Name = "Addison Wesley" (irrelevant to the example, but just for good measure).
Approach 1 - Setting Entity State
using (var context = new Context())
{
var book = new Book();
book.Name = "Service Design Patterns";
book.Publisher = new Publisher() {Id = 2 }; // Only ID is required
context.Entry(book.Publisher).State = EntityState.Unchanged;
context.Books.Add(book);
context.SaveChanges();
}
Approach 2 - Using Attach method
using (var context = new Context())
{
var book = new Book();
book.Name = "Service Design Patterns";
book.Publisher = new Publisher() { Id = 2 }; // Only ID is required
context.Publishers.Attach(book.Publisher);
context.Books.Add(book);
context.SaveChanges();
}
Approach 3 - Setting Foreign Key value
using (var context = new Context())
{
var book = new Book();
book.Name = "Service Design Patterns";
book.PublisherId = 2;
context.Books.Add(book);
context.SaveChanges();
}
For this last approach to work I needed to add extra property PublisherId, it has to be named according to NavigationPropertyName + 'Id" convention to be picked up by EF auotmatically:
public int PublisherId { get; set; }
public Publisher Publisher { get; set; }
I am using here EF5 Code First, but it is very similar to POCO.

Entity Framework does not allow relationships that cross contexts.
If you place the reading of the course and connecting the course to the student within the same using statement, it would work.

I also tried the second option it worked for me. I did like the parent->child relationship happening at an object level first and save to db. Maybe I should just remove all the relationships between the entities that EF generates and manually control this myself.

Having problems while updation in asp.net mvc project

My create and delete operations are working well. But, the Edit function is giving the following error :- Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.
NOTE:- CatPicView is a ViewModel merging the two entities Category and Picture
Following is the code for my Edit action code :-
[HttpPost]
public ActionResult Edit(CatPicView catPic)
{
if (ModelState.IsValid)
{
if (!String.IsNullOrEmpty(catPic.Picture.PictureUrl))
{
if (catPic.Category.PictureId == null)
{
Picture picture = new Picture();
picture.PictureUrl = catPic.Picture.PictureUrl;
db.Pictures.Add(picture);
catPic.Category.PictureId = picture.Id;
}
else
{
db.Entry(catPic.Picture).State = EntityState.Modified;
}
}
db.Entry(catPic.Category).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.ParentCategoryId = new SelectList(db.Categories, "Id", "Name", catPic.Category.ParentCategoryId);
return View(catPic);
}

Using the debuger, check the properties of the object you are trying to update. The most likely is that you have an ID in null.
To fix this, you should place a hidden field holding the id of the modified object so when posting the form it became mapped to your object.

You are using an ID that does not exist in the current context which is picture.Id. At the time that you are using it an ID has not yet been generated, add db.SaveChanges before attempting to use the ID.
if (catPic.Category.PictureId == null)
{
Picture picture = new Picture();
picture.PictureUrl = catPic.Picture.PictureUrl;
db.Pictures.Add(picture);
db.SaveChanges();
catPic.Category.PictureId = picture.Id;
}

EF4.1 Code First Add Entity with Related Entity

I'm using EF4.1 Code First. I can't get a very simple insert to save the related entity ID. The generated SQL always inserts NULL for any related entities. Example code is below. Can anyone see what I'm doing wrong here? It does properly insert non-entity properties, such as strings. Also I have similar code in a DB initializer class to seed test data and it seems to work fine.
using (var ctx = new DataContext())
{
ctx.Users.Attach(existingUser);
// create item and add to context
var newItem = new MyItem();
ctx.MyItems.Add(newItem);
// set related entity
newItem.CreatedBy = existingUser;
ctx.SaveChanges();
}

Your code should work with default configuration of your DbContext. One possible explanation that it does not work is that you have automatic change detection disabled, for instance if you have in your context's constructor something like:
public DataContext()
{
this.Configuration.AutoDetectChangesEnabled = false;
}
In this case EF would not detect the change of the navigation property newItem.CreatedBy after you have added the new item to the context. (SaveChanges would detect this last change if change detection isn't disabled.)
You can change your code so that setting the navigation property happens before you add the new item to the context:
using (var ctx = new DataContext())
{
ctx.Users.Attach(existingUser);
// create item and add to context
var newItem = new MyItem();
// set related entity
newItem.CreatedBy = existingUser;
ctx.MyItems.Add(newItem);
ctx.SaveChanges();
}
This should work with and without automatic change detection.

Try this:
using (var ctx = new DataContext())
{
ctx.Users.Attach(existingUser);
// create item and add to context
var newItem = new MyItem();
ctx.MyItems.Add(newItem);
// set related entity
newItem.CreatedBy = existingUser;
// Added
ctx.ObjectStateManager.ChangeObjectState(newItem.CreatedBy, EntityState.Added);
ctx.SaveChanges();
}
If that doesn't work, change the line with:
ctx.ObjectStateManager.ChangeObjectState(newItem.CreatedBy, EntityState.Modified);
Added 1 line... Hope it helps.