Best way to show old value vs new value in a list of items

1. How do you replace data in an array of objects?
2. How to update value in collection in C#?

How do you replace data in an array of objects?

Use the JavaScript predefined method “splice()” to replace objects in an array. It adds or removes the specified array elements and modifies the original array. It is used in a combination of the indexOf() method to access the index of the specified array element and splice it.

How to update value in collection in C#?

In C#, writing variable = expression; assigns a new value to the variable. It does not affect the value that was previously referenced by that variable.