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    <p>You don't see the relationship being deleted since your proxy is not a change tracking proxy but lazy loading proxy only. To make it a change tracking proxy you need to set all the properties to be virtual. Below please find an example that resets a navigation property without loading it first. Now a question is whether or not to use change tracking proxies - see <a href="http://blog.oneunicorn.com/2011/12/05/should-you-use-entity-framework-change-tracking-proxies/" rel="noreferrer">this post</a> as it contains an interesting discussion on this. </p> <pre><code>public class Computer { public virtual string Id { get; set; } public virtual Nullable&lt;int&gt; UserId { get; set; } public virtual User User { get; set; } } public class User { public int Id { get; set; } public virtual ICollection&lt;Computer&gt; Computers { get; set; } } public class MyContext : DbContext { public DbSet&lt;Computer&gt; Computers { get; set; } public DbSet&lt;User&gt; Users { get; set; } } class Program { static void Main(string[] args) { using (var ctx = new MyContext()) { if (!ctx.Computers.Any()) { var user = ctx.Users.Add(new User()); ctx.Computers.Add(new Computer() { Id = "MyComputer", User = user }); ctx.SaveChanges(); } } using (var ctx = new MyContext()) { var computer = ctx.Computers.Single(); computer.User = null; ctx.SaveChanges(); } using (var ctx = new MyContext()) { var computer = ctx.Computers.Include("User").Single(); Console.WriteLine(computer.User == null); } } } </code></pre>
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    1. PORemoving a navigation property doesn't update the database
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    1. COAha! Thanks for clarification. Is this a new behaviour in EF5/.NET4.5 and didn't this work with .NET 4.0? The article linked in the question says so, but is actually using a model without change tracking proxies.
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    2. COThis is new in .NET Framework 4.5
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    3. CO@pawel Are you sure this is new? I thought this has been in since EF 4.1.
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      1. USLuke McGregor
 

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