How do you convert a string to ascii to binary in C#?

Question

A while back (freshman year of high school) I asked a really good C++ programmer who was a junior to make a simple application to convert a string to binary. He gave me the

Answer 1

Thanks, this is great!! I've used it to encode query strings...

protected void Page_Load(object sender, EventArgs e)
{
    string page = "";
    int counter = 0;
    foreach (string s in Request.QueryString.AllKeys)
    {
        if (s != Request.QueryString.Keys[0])
        {
            page += s;
            page += "=" + BinaryCodec.encode(Request.QueryString[counter]);
        }
        else
        {
            page += Request.QueryString[0];
        }
        if (!page.Contains('?'))
        {
            page += "?";
        }
        else
        {
            page += "&";
        }
        counter++;
    }
    page = page.TrimEnd('?');
    page = page.TrimEnd('&');
    Response.Redirect(page);
}

public class BinaryCodec
{
    public static string encode(string ascii)
    {
        if (ascii == null)
        {
            return null;
        }
        else
        {
            char[] arrChars = ascii.ToCharArray();
            string binary = "";
            string divider = ".";
            foreach (char ch in arrChars)
            {
                binary += Convert.ToString(Convert.ToInt32(ch), 2) + divider;
            }
            return binary;
        }
    }

    public static string decode(string binary)
    {
        if (binary == null)
        {
            return null;
        }
        else
        {
            try
            {
                string[] arrStrings = binary.Trim('.').Split('.');
                string ascii = "";
                foreach (string s in arrStrings)
                {
                    ascii += Convert.ToChar(Convert.ToInt32(s, 2));
                }
                return ascii;
            }
            catch (FormatException)
            {
                throw new FormatException("SECURITY ALERT! You cannot access a page by entering its URL.");
            }
        }
    }
}