Entity Framework. "New transaction is not allowed because there are other threads running in the session."

Task: Resolve error.
Solution: Use new context to update item in iteration.

Explanation:
This exception occurs in the following code:

C#

MyContext db=new MyContext();
var ListOfEntities=from p in db.Entity select p;
foreach(var item in ListOfEntities)
{
    item.Text="Changed!";
    db.SaveChanges();
}

In the following example it will be OK:

C#

MyContext db=new MyContext();

var ListOfEntities=from p in db.Entity select p;

foreach(var item in ListOfEntities)

{

    MyContext anotherDB =new MyContext();

    var MyItem=(from p in anotherDB where p.ID=item.ID select p).FirstOrDefault();

    MyItem.Text="Changed!";

    anotherDB.SaveChanges();

}