C# Convert SecureString to String

SecureStringToString.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            var secure = new SecureString();
            foreach (char c in "p@$$w0rd")
            {
                secure.AppendChar(c);
            }

            var password = new System.Net.NetworkCredential(string.Empty, secure).Password;
            Console.WriteLine(password);

            Func<SecureString, string> SecureToString = secureString =>
            {
                IntPtr valuePtr = IntPtr.Zero;
                try
                {
                    valuePtr = System.Runtime.InteropServices.Marshal.SecureStringToGlobalAllocUnicode(secureString);
                    return System.Runtime.InteropServices.Marshal.PtrToStringUni(valuePtr);
                }
                finally
                {
                    System.Runtime.InteropServices.Marshal.ZeroFreeGlobalAllocUnicode(valuePtr);
                }
            };

            var pass2 = SecureToString(secure);
            Console.WriteLine(pass2);
        }
    }
}