Caesar cipher

// Caesar cipher program

using System;

class Submission
{
    // -------------------------
    // Subprograms
    // -------------------------
    static string encrypt_message(string message)
    {
        int key = 5;
        string encrypted_message = "";
        foreach (char character in message)
        {
            int ascii_code = Convert.ToInt32(character);
            ascii_code = ascii_code + key;
            if (ascii_code > 126)
            {
                ascii_code = 32 + ascii_code - 127;
            }
            encrypted_message = encrypted_message + Convert.ToChar(ascii_code);
        }
        return encrypted_message;
    }


    // -------------------------
    // Main program
    // -------------------------
    public static void Main(string[] args)
    {
        Console.WriteLine("Enter a message: ");
        string actual_message = Console.ReadLine();
        string stored_message = encrypt_message(actual_message);
        Console.WriteLine($"Message to send: {stored_message}");
    }

}