xml to a list

Please post the error message.

It's better to split it for debugging purposes:

foreach (var survey in surveysXml.Descendants("Survey").Where(x => x.Element("SurveyID").Value == idToSearch))
{
	string surveyString = survey.ToString();
	StringReader stringReader = new StringReader(surveyString);
	XmlReader xmlReader = XmlReader.Create(stringReader);
	InvictusRTDatabase.ChartData cd = (InvictusRTDatabase.ChartData)serializer.Deserialize(xmlReader);
	chartData.Add(cd);
}

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If survery.ToString() is failing, it might be because survey is null.

add a null check for survey before executing your code and as ste5an said, split your statement into several statements for easy debuggability.

the error is  "There is an error in XML document (1, 2)." after I put a try catch in
I think it might have to do with below - it is located in a separate class

 public struct ChartData
    {
        public int ChartDataUID { get; set; }
        public int JobID { get; set; }
        public int SurveyID { get; set; }
        public DateTime ChartDataTime { get; set; }
        public float rawDataPoint { get; set; }
        public float filteredDataPoint { get; set; }
        public float Centroid { get; set; }
        public int CentroidOffset { get; set; }
        public override string ToString()
        {
            return string.Format("{0}, {1}, {2}", this.ChartDataUID, this.JobID, this.SurveyID); <----THIS
        }
    }

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           List<InvictusRTDatabase.ChartData> chartData = new List<InvictusRTDatabase.ChartData>();
            string path = System.IO.Path.Combine(Environment.ExpandEnvironmentVariables("%userprofile%"), "Documents") + "\\Invictus" + "\\" + jobid + "\\" + jobid+ ".xml";
             XmlSerializer serializer = new XmlSerializer(typeof(InvictusRTDatabase.ChartData));
            XDocument surveysXml = XDocument.Load(path);//new StringReader(path)
            string idToSearch = SurveyID.ToString();

            foreach (var survey in surveysXml.Descendants("Survey").Where(x => x.Element("SurveyID").Value == idToSearch))
            {
                try
                {
                    if (survey != null)
                    {
                        chartData.Add((InvictusRTDatabase.ChartData)serializer.Deserialize(XmlReader.Create(new StringReader(survey.ToString()))));//new StringReader(survey.ToString()
                    }
                }
                catch (Exception ex)
                {
                    string s = ex.Message;
                }
            }

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Yup, as your question is a f'up, take a look at my samples again.

You need classes and not structs as target and you need to specify at least the XmlRoot() attribute, cause the name ChartData does not match the XML fragments root <survey>.

Otherwise you need to implement ISerializable for your struct.

the  error now is "There is an error in XML document (4, 55)."

Please post a concise and complete example. It's hard to guess.. Craft a small console application and post a sample XML.

at the bottom of my form I placed this

   [XmlRoot("Survey")]
    public struct ChartData
    {
        public int ChartDataUID { get; set; }
        public int JobID { get; set; }
        public int SurveyID { get; set; }
        public DateTime ChartDataTime { get; set; }
        public float rawDataPoint { get; set; }
        public float filteredDataPoint { get; set; }
        public float Centroid { get; set; }
        public int CentroidOffset { get; set; }
        public override string ToString()
        {
            return string.Format("{0}, {1}, {2}", this.ChartDataUID, this.JobID, this.SurveyID);
        }

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I changed my code in the form to this

            List<InvictusRTDatabase.ChartData> chartData = new List<InvictusRTDatabase.ChartData>();
            string path = System.IO.Path.Combine(Environment.ExpandEnvironmentVariables("%userprofile%"), "Documents") + "\\Invictus" + "\\" + jobid + "\\" + jobid+ ".xml";
             XmlSerializer serializer = new XmlSerializer(typeof(ChartData));<-- POINTS TO CHART DATA HERE AT THE BOTTOM
            XDocument surveysXml = XDocument.Load(path);//new StringReader(path)
            string idToSearch = SurveyID.ToString();

            foreach (var survey in surveysXml.Descendants("Survey").Where(x => x.Element("SurveyID").Value == idToSearch))
            {
                try
                {
                    if (survey != null)
                    {
                        chartData.Add((InvictusRTDatabase.ChartData)serializer.Deserialize(XmlReader.Create(new StringReader(survey.ToString()))));
                    }
                }
                catch (Exception ex)
                {
                    string s = ex.Message;
                }
            }

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I don't get whats wrong?

btw, you haven't took a look at the exception, haven't you? Cause it tells you that:

ok so,
I changed the struct at the bottom of the page to

    [XmlRoot("Survey")]
    public struct ChartData
    {
        public int ChartDataUID { get; set; }
        public int JobID { get; set; }
        public int SurveyID { get; set; }
        public string ChartDataTime { get; set; }
        public float rawDataPoint { get; set; }
        public float filteredDataPoint { get; set; }
        public float Centroid { get; set; }
        public int CentroidOffset { get; set; }
        public override string ToString()
        {
            return string.Format("{0}, {1}, {2}", this.ChartDataUID, this.JobID, this.SurveyID);
        }
    }

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and my code to add it to the chart is like so

            List<ChartData> chartData = new List<ChartData>();
            string path = System.IO.Path.Combine(Environment.ExpandEnvironmentVariables("%userprofile%"), "Documents") + "\\Invictus" + "\\" + jobid + "\\" + jobid+ ".xml";
             XmlSerializer serializer = new XmlSerializer(typeof(ChartData));
            XDocument surveysXml = XDocument.Load(path);//new StringReader(path)
            string idToSearch = SurveyID.ToString();

            foreach (var survey in surveysXml.Descendants("Survey").Where(x => x.Element("SurveyID").Value == idToSearch))
            {
                try
                {
                    if (survey != null)
                    {
                        chartData.Add((ChartData)serializer.Deserialize(XmlReader.Create(new StringReader(survey.ToString()))));
                    }
                    
                }
                catch (Exception ex)
                {
                    string s = ex.InnerException.ToString();
                }
            }
            int MyCount = 0;
            for (int i = 0; i < chartData.Count(); i++)
            {
                DateTime date = Convert.ToDateTime(chartData[i].ChartDataTime).AddMilliseconds(250 * MyCount);
                    string strTime = String.Format(CultureInfo.CurrentCulture, "{0:MM/dd/yyyy HH:mm:ss.fff}", date);
                    string format1 = "MM/dd/yyyy HH:mm:ss.fff";
                    S_filteredP.name = DateTime.ParseExact(strTime, format1, null);
                    S_filteredP.Value = float.Parse(chartData[i].filteredDataPoint.ToString(), CultureInfo.CurrentCulture);
                    S_rawP.name = DateTime.ParseExact(strTime, format1, null);
                    S_rawP.Value = float.Parse(chartData[i].rawDataPoint.ToString(), CultureInfo.CurrentCulture);
                    S_centroidP.name = DateTime.ParseExact(strTime, format1, null);
                    S_centroidP.Value = float.Parse(chartData[i].Centroid.ToString(), CultureInfo.CurrentCulture);
                    rawSeries.DataPoints.Add(new CategoricalDataPoint() { Value = S_rawP.Value, Category = S_rawP.name });
                    filteredSeries.DataPoints.Add(new CategoricalDataPoint() { Value = S_filteredP.Value, Category = S_filteredP.name });
                    centSeries.DataPoints.Add(new CategoricalDataPoint() { Value = S_centroidP.Value, Category = S_centroidP.name });
                    MyCount++;
            }

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thanks