Databinding ADO.NET
https://msdn.microsoft.com/en-us/library/ms973824.aspx
Databinding .NET Winforms
https://msdn.microsoft.com/en-us/library/jj943772.aspx
Load a Dataset from XML
https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/dataset-datatable-dataview/loading-a-dataset-from-xml
Writing Dataset as XML Data
https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/dataset-datatable-dataview/writing-dataset-contents-as-xml-data

COM Components
https://msdn.microsoft.com/en-us/library/ms973800.aspx

WCF-Webservice
https://docs.microsoft.com/en-us/visualstudio/data-tools/walkthrough-creating-a-simple-wcf-service-in-windows-forms
WCF mit ASP.NET
https://docs.microsoft.com/en-us/previous-versions/aspnet/8wbhsy70(v=vs.100)

WPF Databinding
https://docs.microsoft.com/en-us/dotnet/desktop/wpf/data/?view=netdesktop-6.0

IService
[ServiceContract]
public interface IProduct
{
    [OperationContract]
    string GetID(int rno);

    [OperationContract]
    string GetName(int rno);

    [OperationContract]
    string GetDesc(int rno);

}

Service
public class Product : IProduct
{

    public string GetID(int rno)
    {
        DataSet ds = new DataSet();
        try
        {
            ds.ReadXml("~/Products.xml");
            string res = ds.Tables[0].Rows[rno][0].ToString();
            return res;
        }
        catch
        {
            return "No More Data";
        }
    }

    public string GetName(int rno)
    {
        DataSet ds = new DataSet();
        try
        {
            ds.ReadXml("Products.xml");
            string res = ds.Tables[0].Rows[rno][0].ToString();
            return res;
        }
        catch
        {
            return "No More Data";
        }
    }

    public string GetDesc(int rno)
    {
        DataSet ds = new DataSet();
        try
        {
            ds.ReadXml("Products.xml");
            string res = ds.Tables[0].Rows[rno][0].ToString();
            return res;
        }
        catch
        {
            return "No More Data";
        }
    }
}