Add New Controller to MVC 4 - asp.net-mvc

Question

I want to add new controller to my MVC application.Here is my screen
First of all MovieDBContext do not exist in this list,
I created New one. When i press Add button,I get this popup error
Do i need to create Model first? Here is my Model code
`public class LogOn
{
Database db = DatabaseFactory.CreateDatabase("MovieDBContext");
public int Id { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
}`
My web.config has this code
<add name="MovieDBContext" connectionString="Data Source=.\SQLExpress;Initial Catalog=test;User ID = sa; Password = 123456;"
providerName="System.Data.SqlClient" />

Answer 1

I think you should do this:
public class LogOn
{
public int Id { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
}
public class LogOnContext : DbContext
{
public LogOnContext() : base("MovieDBContext")
{
}
public DbSet<LogOn> LogOns{ get; set; }
}
Then build project and add a scaffolding item (controller).
You need to change because there's an ambiguous reference:
replace in Edit() method (after controller scaffolding):
db.Entry(logon).State = EntityState.Modified;
with:
db.Entry(logon).State = System.Data.Entity.EntityState.Modified;
Your Edit method should look like as follows:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include="Id,UserName,Password")] LogOn logon)
{
if (ModelState.IsValid)
{
db.Entry(logon).State = System.Data.Entity.EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(logon);
}

Answer 2

After you create the model as follows:
public class LogOn
{
public int Id { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
}
public class LogOnContext : DbContext
{
public LogOnContext()
: base("MovieDBContext")
{
}
public DbSet<LogOn> LogOns { get; set; }
}
and buil project when you select Data Context class you select (in scaffolding menu)
LogOnContext (MvcFirst.Models) not MvcFirst.Models.DBContext

Answer 3

I had the same problem. I used entity framework version 6. Then I found that it was happening for EF. Because version 6 does not support scaffolding properly with MVC 4. Then I remove it and replace it with version 5. This tricks may be help you. If it helps please give a vote. Thanks