Binding and modifying an XML deserialised object

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C#

XML

I have some XML data in the form

<GPSettings>
 <ProductCount>3</ProductCount>
 <MainDelimiter>:</MainDelimiter>
 <SubDelimiter>space</SubDelimiter>
<GPProducts>
<GPProduct>
 <ProductName>myProduct1</ProductName>
 <ProductCode>1234</ProductCode>
 <ConfigurationCount>2</ConfigurationCount>
 <Current>1</Current>
<GPConfigurations>
<GPConfiguration>
 <ConfigurationName>myConfigProd1</ConfigurationName>
 <PairCount>7</PairCount>
 <CustomPairCount>1</CustomPairCount>
<GPPairs>
<GPPair>
 <Name>Width1</Name>
 <ResultString>m_Width1</ResultString>
 <DefaultValue>15</DefaultValue>
 <UseDefault>false</UseDefault>
 <IncludeInString>true</IncludeInString>
 <Comment>This is Width 1</Comment>
 <Order>7</Order>
 </GPPair>
<GPair>
 <Name>Width2</Name>
 <ResultString>m_Width2</ResultString>
 <DefaultValue>100</DefaultValue>
 <UseDefault>true</UseDefault>
 <IncludeInString>true</IncludeInString>
 <Comment>This is Width 2</Comment>
 <Order>2</Order>
 </GPPair>

I deserialize into my classes set up as below:

[Serializable()]
    [XmlRoot("Settings")]
    public class Settings
    {
        [XmlElement("ProductCount")]
        public int ProductCount{ get; set; }
        [XmlElement("MainDelimiter")]
        public string MainDelimiter { get; set; }
        [XmlElement("SubDelimiter")]
        public string SubDelimiter { get; set; }

        [XmlArray("GPProducts")]
        [XmlArrayItem("GPProduct", typeof(GPProduct))]
        public GPProduct[] GPProduct { get; set; }

[Serializable()]
    public class GPProduct
    {
        [XmlElement("ProductName")]
        public string ProductName { get; set; }
        [XmlElement("ProductCode")]
        public string ProductCode { get; set; }
        [XmlElement("ConfigurationCount")]
        public int ConfigurationCount { get; set; }
        [XmlElement("Current")]
        public int Current { get; set; }

        [XmlArray("GPConfigurations")]
        [XmlArrayItem("GPConfiguration", typeof(GPConfiguration))]
        public GPConfiguration[] GPConfiguration { get; set; }

[Serializable()]
    public class GPConfiguration
    {
        [XmlElement("ConfigurationName")]
        public string ConfigurationName { get; set; }
        [XmlElement("PairCount")]
        public int PairCount { get; set; }
        [XmlElement("CustomPairCount")]
        public int CustomPairCount { get; set; }

        [XmlArray("GPPairs")]
        [XmlArrayItem("GPPair", typeof(GPPair))]
        public GPPair[] GPPair { get; set; }

[Serializable]
    public class GPPair : IComparable
    {
        [XmlElement("Name")]
        public string Name { get; set; }
        [XmlElement("ResultString")]
        public string ResultString { get; set; }
        [XmlElement("DefaultValue")]
        public string DefaultValue { get; set; }
        [XmlElement("UseDefault")]
        public bool UseDefault { get; set; }
        [XmlElement("IncludeInString")]
        public bool IncludeInString { get; set; }
        [XmlElement("Comment")]
        public string Comment { get; set; }
        [XmlElement("Order")]
        public int Order { get; set; }

Deserialization with:

string path = @"C:\test.xml";
            XmlSerializer serializer = new XmlSerializer(typeof(GPSettings));
            StreamReader reader = new StreamReader(path);
            GPSettings = (GPSettings)serializer.Deserialize(reader);
            reader.Close();

The main form contains two combo boxes which allow for selection of the GPProduct and the GPConfigurations, and then the GPPair values are all displayed in a datagridview.

I want to be able to add a row to this datagridview and have the underlying object updated for serialization later. I can find no good way to get this done, any ideas?

Thanks