using System;

​

public class Program

{

    public static void Main()

    {

        Simple();   

        Complex();  

    }

    public static void Simple() {

​

        dynamic MyColumn = "myData";

        Console.WriteLine($"{(MyColumn).ToUpper()}");

    }

    public static void Complex() {

​

        dynamic RequiresMaskAccountNumber = true;

        dynamic AccountHolderLastName = "Methyldioxorhenamylphentermine";

        dynamic AccountNumber = "1234567889";

        AccountNumber = "";

        Console.WriteLine($"{(string.IsNullOrEmpty((string)(AccountNumber)) ? "empty": "not empty")}");

        AccountNumber = "1234567889";

        Console.WriteLine($"{(((bool)(RequiresMaskAccountNumber)) ? ((AccountHolderLastName).Substring(0,Math.Min(22, AccountHolderLastName.Length)).ToUpper()) + (AccountNumber).Substring(0,4) : (AccountNumber))}");

    }

}

​

​