How to update a row using Entity Framework code first?

Question

How should I go about updating a row in the database? There is no update method, and if I use add and the primary key id already exists, I get an exception. Please provide an ex

Answer 1

Here is a way that worked for me without having to make a query first:

context.Students.Attach(student);
context.Entry(student).State = EntityState.Modified;
context.SaveChanges();