I completed the address book task provided in the wrap up of C# basics. Is there anything I could have done better?

        var mainbook = new Entry[]
        {
            new Entry("Jonathan", "Banks", "03424234234", "a", "nohalfm23@gmail.com"),
            new Entry("Will", "Arnett", "334847838322", "f", "wedemandtobetakenseriously@hotmail.co.uk"),
            new Entry("Andy", "Bernard", "984783837838", "f", "AndyDeservedBetter@hotmail.co.uk"),
            new Entry("Dylan", "Maxwell", "028372615273", "a", "innocentman@gmail.com"),
            new Entry("Bryan", "Cranston", "382939000272", "f", "bettercallhal@gmail.com"),
            new Entry("Ed", "Helms", "984783837838", "f", "AndyDeservedBetter@hotmail.co.uk"),
            new Entry("Jimmy", "Mcgill", "392582386549", "a", "its_all_good@gmail.com"),
            new Entry("Andy", "Dwyer", "395238384595", "cccccc", "BertMaclinFBI911@hotmail.co.uk"),
            new Entry("Bojack", "Horseman", "398234562395", "f", "sadhorse2@hotmail.co.uk"),
            new Entry("Butterscotch", "Horseman", "444444444444", "cccccc", "FreeChurro@hotmail.co.uk")

        };
        List<Entry> addressBook = new List<Entry>();
        addressBook.AddRange(mainbook);

        while (true)
        {
            //Get command from user then split it up into an array.
            string entry = Console.ReadLine();
            string[] splitentry = entry.Split(new char[] { ' ' });
            //See what the command starts with
            if (entry.ToLower().StartsWith("search"))
            {
                SearchEntry(addressBook, splitentry);
            }
            else if (entry.ToLower().StartsWith("add"))
            {
                AddEntry(addressBook, splitentry);
            }
            //If user types "quit" then the program stops.
            else if (entry.ToLower().Trim() == "quit")
            {
                break;
            }
            else if (entry.ToLower().Trim() == "help")
            {
                Console.WriteLine("Type 'search' to search for an entry.\nType 'add' to add an entry (EXAMPLE: add [firstName] [surname] [phoneNumber] [address] [email])\nType 'view' to view the address book.\nType 'help' for a list of commands.\nType 'quit' to exit the program.\n");
            }
            else if (entry.ToLower().Trim() == "view")
            {
                View(addressBook);
            }
        }
    }

    static public void View(List<Entry> addressBook)
    {
        //Prints out each entry seperately as long as they are both valid and visible.
        for (int i = 0; i < addressBook.Count; i = i + 1)
        {
            if (addressBook[i].valid && addressBook[i].visible)
            {
                Console.WriteLine(addressBook[i].details[0] + " " + addressBook[i].details[1] + "\t\t " + addressBook[i].details[2] + "\t " + addressBook[i].details[3] + "\t " + addressBook[i].details[4]);
            }
            else if (!addressBook[i].valid && addressBook[i].visible)
            {
            Console.WriteLine(addressBook[i].details[0] + " is not a valid entry. Please check over this entry.");
            }
        }
        Console.WriteLine(" ");
    }
    static public void AddEntry(List<Entry> addressBook, string[] entry)
    {
        //Trys incase entry array is not big enough.
        try
        {
            addressBook.Add(new Entry(entry[1], entry[2], entry[3], entry[4], entry[5]));
            Console.WriteLine("New Entry Added: " + entry[1] + " " + entry[2] + " " + entry[3] + " " + entry[4] + " " + entry[5]);
        }
        catch { Console.WriteLine("New entry could not be added."); }

    }

    static public void SearchEntry(List<Entry> addressBook, string[] entry)
    {
        //Checks to see if the second word in the command equals one of the variable entries' strings.
        string[] entries = { "firstname", "surname", "phone", "address", "email" };
        if (entries.Contains(entry[1].ToLower()))
        {
            //Gives the int index the index of the second word in the command corresponding to the entries array
            int index = Array.IndexOf(entries, entry[1].ToLower().Trim());
            //Checks if each entry in the address book is equal to the third word in the command. If not, it will not show up.
            foreach (Entry f in addressBook)
            {
                if (!(f.details[index] == entry[2]))
                {
                    f.visible = false;
                }
            }
            View(addressBook);
            //Sets all the entries back to being visible
            foreach (Entry f in addressBook)
            {
                    f.visible = true;
            }

        }
        else Console.WriteLine("Unrecognized type: " + entry[1]+"\n");
    }
}
    class Entry
{
    public bool valid = true, visible=true;
    public string[] details = new string[5]; 
    public Entry(string FirstName, string LastName, string PhoneNumber, string Address, string Email)
    {
        try
        {
            details[0] = FirstName;
            details[1] = LastName;
            details[2] = PhoneNumber;
            details[3] = Address;
            details[4] = Email;
        } catch
        {
            valid = false;
        }
    }
}