Changes made on “copy” list are reflecting original list - c#

Question

I have two lists, the original one and a copied one. I made a copy of the original list, because of one reason:

I need to process/work data from the original list, but I

Answer 1

The collection that you are referring to as 'Copy List' is not actually a Copy.

The elements inside the Collection are referring to the same Objects as in the Original Collection.

You will have to replace your copying foreach loop with something like this:

foreach (var item in forPrintKitchen)
{
    forPrintKitchenOrders.Add(item.Clone()); // The clone method should return a new Instance after copying properties from item.
}

The Clone method should create new Instance and copy each of the properties from the instance being cloned and then return the newly created Instance.

Basically you'll have to define a method named Clone (name doesn't matter) in OrderTemp class like this:

public class OrderTemp
{
    /*  other members of the class */
    public OrderTemp Clone()
    {
        return new OrderTemp
        {
            property1 = this.property1;
            property2 = this.property2;
            /* and so on */
        };
    }
}