What causing this “Invalid length for a Base-64 char array”

Question

I have very little to go on here. I can\'t reproduce this locally, but when users get the error I get an automatic email exception notification:

Answer 1

Try this:

public string EncodeBase64(string data)
{
    string s = data.Trim().Replace(" ", "+");
    if (s.Length % 4 > 0)
        s = s.PadRight(s.Length + 4 - s.Length % 4, '=');
    return Encoding.UTF8.GetString(Convert.FromBase64String(s));
}