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Suppose we have class PersonModel, user edits a detail form in the browser and hits the submit button.
How to write a controller logic to create an UPDATE SqlComand (no EF) and update only those of fields from class PersonModel (FirstName, LastName, Age...) which have been changed.
What should be an argument of the /Person/Edit/<id> controller?
You don’t do anything special to your MVC code, and you don’t add any special URL parameters.
If you only want to update the changed fields, then you have to write a lot of code. You have to get the current record, compare each of your models fields to the records fields, figure out which ones have changed, then you have to construct a SQL statement based on the changed fields, then update it, making sure to use optomistic record locking to insure the field has not changed between when you retrieved it and when you update it.
This is probably going to be a couple hundred lines of code. Or it could be one line of code if you were using an ORM.
Also, keep in mind you need to use parameterized statements as well, to insure against a SQL injection attack (something you get for free in an ORM as well).
Good luck, I certainly am not going to write it.