C# strange behaviour in foreach loop

You gradually end up with all of your various variables referencing the same array (value), with whatever values are written into that array by the last iteration being set.

There's a very similar way of writing this code that avoids the issue:

    private void pieceoftestcode()
    {
        string[] county = new string[4];
        string[] city = new string[4];
        string[] markets = new string[4];
        string[] streets = new string[4];
        string[] items = new string[4] { "apple", "banana", "pineapple", "juice" };
        string[] value;
        foreach (string item in items)
        {
            if (item == "apple")
                value = markets;
            else if (item == "banana")
                value = streets;
            else if (item == "pineapple")
                value = county;
            else
                value = city;
            for (int i = 0; i <= 3; i++)
            {
                if (item == "apple")
                    value[i] = (2 * i).ToString();
                else
                    value[i] = i.ToString();
            }


        }
        MessageBox.Show("test");
    }

Now, each time through the loop value get assigned a reference to a different array¹ and so the for loop doesn't overwrite its previous efforts.

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¹Assuming items doesn't contain any duplicate items nor more than one non-apple, -banana or -pineapple item.