Cannot implicitly convert type ‘System.Data.EntityState’ to ‘System.Data.Entity.EntityState’. An explicit conversion exists (are you missing a cast?)

I am getting this error in asp.net when using Entity Framework :
“Cannot implicitly convert type System.Data.EntityState to System.Data.Entity.EntityState. An explicit conversion exists (are you missing a cast?)”

Here is the snippet:

foreach (OrderLine line in order.OrderLines)
{
    context.Entry(line.Product).State = System.Data.EntityState.Modified;
}

Please suggest what should I do to resolve the error.

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

When you are using EF 6 or moving from EF 5 to EF 6, you should use System.Data.Entity.EntityState instead of System.Data.EntityState. This error happens when your project has reference to EF6 but you have code for EF5.

Also, check this link: When upgrading from EF5 to EF6 should I replace System.Data.Objects?.

Method 2

Your code must be like this:

if (ModelState.IsValid)
{
    db.Entry(movie).State = System.Data.Entity.EntityState.Modified;
    db.SaveChanges();
    return RedirectToAction("Index");
}
return View(movie);

Method 3

This happened to me in a generated controller. It works for me after removing using System.Data.EntityState and adding using Microsoft.EntityFrameworkCore

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0