Entity Framework and contexts?

Question

.NET

If I received an object from one context, then I pass it to the method, where I open the same context.
I make changes to the object and do SaveChanges, will the data be saved in the database or should I do SaveChanges in the context where I selected the object from?

Answer 1

Example:

var context1=new MyContext();
var context2=new MyContext();
var entity1=context1.Entities1.First();
entity1.Field1=5;
context2.SaveChanges();

The data will not be saved. Each context has its own Changes Tracker (change tracker), and based on it makes changes to the database.
in this case there are 2 options, dependency injection, and pass the context down the call chain, or

context2.Entry(entity1).State = EntityState.Modified;
context2.SaveChanges();

Answer 2

This is simply checked