using System;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        // Replace this with your failing Base64 string

        string failingBase64 = "";

​

        try

        {

            // Decode the Base64 string

            byte[] decodedBytes = Convert.FromBase64String(failingBase64);

​

            // Convert the decoded bytes back to a string (assuming it's UTF-8 encoded)

            string decodedString = Encoding.UTF8.GetString(decodedBytes);

​

            Console.WriteLine("Decoded String:");

            Console.WriteLine(decodedString);

        }

        catch (FormatException ex)

        {

            Console.WriteLine("Error: The input is not a valid Base64 string.");

            Console.WriteLine("Exception:" + ex.Message);

        }

    }

}

​

​

​