Parsing XML File part 2

private static string ParseXMLDS(string xmlDS)
{
    try
    {
        var doc = XDocument.Load(xmlDS);
        string Transaction = "";
        string Error = "";
        StringBuilder Data = new StringBuilder();

        // Query the Data section and write out FileToCompress value
        var query = from c in doc.Root.Descendants("Data")
                    select c.Element("FileToCompress");

        Data.Append("Decompressed Files:");
        foreach (string name in query)
        {
            Data.AppendLine(name);
        }


        // Query the Transaction section and write out a subset of Transaction
        var query1 = from d in doc.Root.Descendants("Transaction")
                     select new
                     {
                         TransactionID = d.Element("TransactionID").Value,
                         TransactionDate = d.Element("TransactionDate").Value,
                         CompressedFileName = d.Element("CompressedFileName").Value,
                         TransactionSuccessFlag = d.Element("TransactionSuccessFlag").Value,
                         TransactionErrors = d.Element("TransactionErrors").Value
                     };
        foreach (var details in query1)
        {
            Transaction = "Transaction Details:" + "\r\n" + Convert.ToString(details) + "\r\n";
        }

        // Query the Error section and write out a subset of Error
        var query2 = from e in doc.Root.Descendants("Error")
                     select new
                     {
                         TransactionID = e.Element("transactionID").Value,
                         ErrorMessage = e.Element("ErrorMessage").Value,
                         InnerException = e.Element("InnerException").Value,
                         StackTrace = e.Element("StackTrace").Value,
                         Data = e.Element("Data").Value
                     };

        foreach (var errors in query2)
        {
            Error = "Error Details:" + "\r\n" + Convert.ToString(errors);
        }

        //Format the Strings so output is not all on one line
        Transaction = Transaction.Replace("{", "");
        Transaction = Transaction.Replace("}", "");
        Transaction = Transaction.Replace(",", "\r\n");
        Error = Error.Replace("{", "");
        Error = Error.Replace("}", "");
        Error = Error.Replace(",", "\r\n");

        //Check Transaction details for Errors
        if (Transaction.Contains("TransactionErrors = No Errors") == true)
        {
            //No Errors return Transaction & Data info 
            return Transaction.ToString() + "\r\n" + Data.ToString();
        }
        else
        {
            //Errors return Error info
            return Error.ToString();
        }               
    }
    catch (Exception ex)
    {
        return ex.Message;
    }
}

  <?xml version="1.0" encoding="utf-8" ?> 
- <NewDataSet>
- <Error>
  <TransactionID>adf540ec-05b0-49c9-98f5-44eea57c0b27</TransactionID> 
  <ErrorMessage /> 
  <InnerException /> 
  <StackTrace /> 
  <Data /> 
  </Error>
- <Data>
  <TransactionID>adf540ec-05b0-49c9-98f5-44eea57c0b27</TransactionID> 
  <TransactionDateTimeStamp>0001-01-01T00:00:00-06:00</TransactionDateTimeStamp> 
  <FileToCompress>Test.aspx</FileToCompress> 
  <DirectoryToCompress>C:Inetpub/Test</DirectoryToCompress> 
  <CompressedFileName>Test.aspx</CompressedFileName> 
  <Action>Decompress</Action> 
  </Data>
- <Transaction>
  <TransactionID>adf540ec-05b0-49c9-98f5-44eea57c0b27</TransactionID> 
  <TransactionDate>2013-10-29T09:14:01.4803735-05:00</TransactionDate> 
  <CompressedFileName /> 
  <TransactionSuccessFlag>true</TransactionSuccessFlag> 
  <TransactionErrors>No Errors</TransactionErrors> 
  </Transaction>
  </NewDataSet>

  <?xml version="1.0" encoding="utf-8" ?> 
- <NewDataSet>
- <Error>
  <TransactionID>adf540ec-05b0-49c9-98f5-44eea57c0b27</TransactionID> 
  <ErrorMessage /> 
  <InnerException /> 
  <StackTrace /> 
  <Data /> 
  </Error>
- <Error>
  <TransactionID>adf540ec-05b0-49c9-98f5-44eea57c0b27</TransactionID> 
  <ErrorMessage>Object reference not set to an instance of an object.</ErrorMessage> 
  <StackTrace>at EvalDSConfigsToXMLStreamThreadWithState.ThreadProc() in d:\test\Tools_Apps\XMLReaderWriter.cs:line 268</StackTrace> 
  <Data>System.Collections.ListDictionaryInternal</Data> 
  </Error>
- <Data>
  <TransactionID>adf540ec-05b0-49c9-98f5-44eea57c0b27</TransactionID> 
  <TransactionDateTimeStamp>0001-01-01T00:00:00-06:00</TransactionDateTimeStamp> 
  <FileToCompress /> 
  <DirectoryToCompress /> 
  <CompressedFileName /> 
  <Action>Error Reading First Directory</Action> 
  </Data>
- <Transaction>
  <TransactionID>adf540ec-05b0-49c9-98f5-44eea57c0b27</TransactionID> 
  <TransactionDate>2013-10-29T09:14:01.4803735-05:00</TransactionDate> 
  <CompressedFileName /> 
  <TransactionSuccessFlag>true</TransactionSuccessFlag> 
  <TransactionErrors>No Errors</TransactionErrors> 
  </Transaction>
- <Transaction>
  <TransactionID>adf540ec-05b0-49c9-98f5-44eea57c0b27</TransactionID> 
  <TransactionDate>2013-10-29T09:14:01.4959735-05:00</TransactionDate> 
  <CompressedFileName /> 
  <TransactionSuccessFlag>false</TransactionSuccessFlag> 
  <TransactionErrors /> 
  </Transaction>
  </NewDataSet>