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// 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}==)$";