C#

//Lists as properties
List<RCH.EL.EMR.Allergies> AllAllergies
{ get; set; }

List<RCH.EL.EMR.Allergies> RemainingAllergies
{ get; set; }

List<RCH.EL.EMR.Allergies> PatientAllergies
{ get; set; }

//Method that seperates the items in the lists
private void ResolveAllergies()
{
    RemainingAllergies = AllAllergies.Except(PatientAllergies).ToList();
}

//Method that binds
protected override void BindListBoxes()
{
    lstAllergies.DataSource = RemainingAllergies;
    lstAllergies.DisplayMember = "AllergyAr";
    lstAllergies.ValueMember = "ID";

    lstPatientAllergies.DataSource = PatientAllergies;
    lstPatientAllergies.DisplayMember = "AllergyAr";
    lstPatientAllergies.ValueMember = "ID";
}

//event handler methods that move the items from one list to the other (arrow buttons on the form)
private void btnAddLeft_Click(object sender, EventArgs e)
{
    
    PatientAllergies.Add((RCH.EL.EMR.Allergies)lstAllergies.SelectedItem);
    ResolveAllergies();
    lstAllergies.Refresh();
    lstPatientAllergies.Refresh();
    BindListBoxes();
}

private void btnAddRight_Click(object sender, EventArgs e)
{

    PatientAllergies.Remove((RCH.EL.EMR.Allergies)lstAllergies.SelectedItem);
    ResolveAllergies();
    lstAllergies.Refresh();
    lstPatientAllergies.Refresh();
    BindListBoxes();
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections;

namespace MachineProblem
{
    class Program
    {

        static void Main(string[] args)
        {
        
            string passedStatement = " ";
            string[] stringHolder = null;

            GetStatement(stringHolder, ref passedStatement);
            SyntaxVerifier(stringHolder, ref passedStatement);

            Console.Read();

        }

        public static void GetStatement(string[] arrayBox, ref string statement)
        {

            Console.WriteLine("Write an example of a for loop statement: ");
            statement = Console.ReadLine();

            foreach (string token in Tokenizer(arrayBox, statement))
            {
                
            }

        }

        //the function that tokenizes the string
        public static string[] Tokenizer(string[] strBox, string tokenizeStatement)
        {

            strBox = null;

            //marks the end of the string to be tokenized
            Regex strTokenizer = new Regex(@"([\;\(\)\ \\])");

            for (int i = 0; i < strTokenizer.Split(tokenizeStatement).Length; i++)
            {

                //tokenized string passed to an empty array
                strBox = strTokenizer.Split(tokenizeStatement);

            }

            return strBox;

        }

        //the function used to check the entered statement if it's a correct syor not
        public static void SyntaxVerifier(string[] arrayString, ref string passedsyntax)
        {
            string pattern = @"(for\s*[\(]\s*int\s*[a-zA-Z\d]*\s*=\s*[\d]*\s*;\s*[a-zA-Z\d]*\s*[\<\>]\s*[\d]\s*;\s*[a-zA-z\d]*\s*[\-(1)])";
            string stringStatement = "for(int x=0; x<5; x++) Console.WriteLine(\"Hello\")";

            //arrayString = null;

            //arrayString = Tokenizer(arrayString, passedsyntax);


            foreach (string words in arrayString)
            {
                stringStatement = words;
                stringStatement.Trim();

            }
        }

    }
}