using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        try {

            var surveyResponse1 = new SurveyResponse();

            surveyResponse1.Answer = "";

            var ans1 = Convert.ToDecimal(surveyResponse1.Answer);

            Console.WriteLine(ans1);

        } catch (Exception ex) {

            Console.WriteLine("1");

            Console.WriteLine(ex);

        }

        try {

            var surveyResponse2 = new SurveyResponse();

            surveyResponse2.Answer = null;

            var ans2 = Convert.ToDecimal(surveyResponse2.Answer);

            Console.WriteLine(ans2);

        } catch (Exception ex) {

            Console.WriteLine("2");

            Console.WriteLine(ex);

        }

    }

}

​

public class SurveyResponse {

    public string Answer { get; set; }

}