badPracticeOfCode.cs

/*
The following code creates five random OrderIDs
to test the fraud detection process. OrderIDs
consist of a letter from A to E, and a three
digit number. Ex: A123.
*/
Random random = new Random();
string[] orderIDs = new string[5];

// Loop through each blank orderID
for (int i = 0; i < orderIDs.Length; i++)
{
    // Get a random value that equates to ASCII letters A through E
    int prefixValue = random.Next(65, 70);
    // Convert the random value into a char, then a string

    string prefix = Convert.ToChar(prefixValue).ToString();
    // Create a random number, padd with zeroes

    string suffix = random.Next(1, 1000).ToString("000");
    // Combine the prefix and suffix together, then assign to current OrderID
    orderIDs[i] = prefix + suffix;
}

// Print out each orderID

foreach (var orderID in orderIDs)
{
    Console.WriteLine(orderID);
}