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POUnable to update MVC3 Model - InvalidOperationException
 

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  1. POUnable to update MVC3 Model - InvalidOperationException
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    <p>I am fairly new to prgramming in general. I have a database with 3 tables in it. A table called <code>User</code> with a foreign Key <code>TypeID</code> null, a table called <code>Login</code> that has a foreign key <code>UserID</code> null and <code>TypeID</code> not null, and a table called <code>Types</code> with <code>TypeID</code> as the primary key. When I tried to update my entity Model, I receive an <code>Invalid InvalidOperationException</code>. </p> <pre><code>at System.Data.Objects.ObjectStateManager.ChangeObjectState(Object entity, EntityState entityState) at MBMVCApplication.Controllers.LoginController.Edit(Users user, Int32 TypeID) in C:\Development\MBMVCApplication\Controllers\LoginController.cs:line 130 at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.&lt;&gt;c__DisplayClass15.&lt;InvokeActionMethodWithFilters&gt;b__12() at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) </code></pre> <p><strong>Code</strong></p> <pre><code>[HttpPost] public ActionResult Edit(Login login, int? typeID) { if (ModelState.IsValid) { db.Logins.Attach(login); //TypeID display on a dropdown box //I also remove the two line below and still get the error login.User.TypeID = typeId.Value; db.ObjectStateManager.ChangeObjectState(login, EntityState.Modified); //The error occurs here or db.SaveChanges(); //Here return RedirectToAction("Index"); } ViewBag.UserID = new SelectList(db.Users, "UserID", "FirstName", login.UserID); ViewBag.TypeID= new SelectList(db.Types, "TypeID", "Description", login.TypeID); return View(login); } </code></pre>
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