using System;

public class Program

{

    public static void Main()

    {

        string bad = "Disney.Globe.Sale.ProcessExternalBillingSale+<Execute>d__19";

        string good = "Disney.Globe.Sale.ProcessExternalBillingSale";

        Console.WriteLine(Sanitize(bad));

        Console.WriteLine(Sanitize(good));

    }

    public static string Sanitize(string input)

    {

        if (string.IsNullOrEmpty(input))

            return input;

        int plusIndex = input.IndexOf("+");

        if (plusIndex == -1)

            return input;

        return input.Substring(0, plusIndex);

    }

}

​