Base64 Encode Decode
// Encode base64
private static string Base64Encode(string plainText)
{
var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
return Convert.ToBase64String(plainTextBytes);
}
// Decode base64
private static string Base64Decode(string base64EncodedData)
{
var base64EncodedBytes = Convert.FromBase64String(base64EncodedData);
return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
}
// RegEx Pattern for Base64
var pattern = "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$";