c#: refactoring nested conditionals example

RefactorNestedConditionals.cs

using System;

namespace Program
{
    class Program
    {
        /// <summary>
        /// Show way to reduce cyclomatic complexity in nested conditionals.
        /// </summary>
        /// <param name="args"></param>
        public static void Main(string[] args)
        {
            string a = "Ishmael";

            if ( string.Compare(a,string.Empty) > 0 )
            {
                if (!string.IsNullOrWhiteSpace(a))
                {
                    if (a.Length > 0)
                    {
                        Console.WriteLine("Original Result: Call me {0}.", a);
                    }
                }
            }

            // After refactoring:
            var isValidString = (string.Compare(a, string.Empty) > 0) 
                && (!string.IsNullOrWhiteSpace(a)) 
                && (a.Length > 0);
            
            if (isValidString)
            {
                Console.WriteLine("After Refactoring: Call me {0}.", a);
            }

            Console.WriteLine("Press any key to quit...");
            Console.ReadKey();
        }
    }
}