Question

i added xml file in my windows application, i want to add values to that from textbox..
i used the following code,

string path = "codedata.xml";
        XmlDocument doc = new XmlDocument();
        if (!System.IO.File.Exists(path))
        {
            //Create neccessary nodes
            XmlDeclaration declaration = doc.CreateXmlDeclaration("1.0", "UTF-8", "yes");
            XmlComment comment = doc.CreateComment("This is an XML Generated File");
            doc.AppendChild(declaration);
            doc.AppendChild(comment);
        }
        else //If there is already a file
        {
            //    //Load the XML File
            doc.Load(path);
        }

        //Get the root element
        XmlElement root = doc.DocumentElement;

        XmlElement Subroot = doc.CreateElement("data");
        XmlElement Companycode = doc.CreateElement("Companycode");
        XmlElement Productcode = doc.CreateElement("Productcode");
        XmlElement Productname = doc.CreateElement("Productname");
        XmlElement Brandcode = doc.CreateElement("Brandcode");
        XmlElement Brandname = doc.CreateElement("Brandname");

        Companycode.InnerText = txt_companycode.Text;
        Productcode.InnerText = txt_productcode.Text;
        Productname.InnerText = txt_productname.Text;
        Brandcode.InnerText = txt_brandcode.Text;
        Brandname.InnerText = txt_brandname.Text;

        Subroot.AppendChild(Companycode);
        Subroot.AppendChild(Productcode);
        Subroot.AppendChild(Productname);
        Subroot.AppendChild(Brandcode);
        Subroot.AppendChild(Brandname);
        root.AppendChild(Subroot);
        doc.AppendChild(root);


        //Save the document
        doc.Save(path);


        //Show confirmation message
        MessageBox.Show("Details  added Successfully");

it showing error near root.AppendChild(Subroot); can any one help me, wer i made mistake.

Answer 1

The root is null. Try to add Root element when you create XML file.

 if (!System.IO.File.Exists(path))
        {
            //Create neccessary nodes
            XmlDeclaration declaration = doc.CreateXmlDeclaration("1.0", "UTF-8", "yes");
            XmlComment comment = doc.CreateComment("This is an XML Generated File");
            doc.AppendChild(declaration);
            doc.AppendChild(comment);
            doc.AppendChild(doc.CreateElement("Root"));
        }

Or use LINQ-XML

string _file=@"c:\sample.xml";
XDocument doc;

if (!File.Exists(_file))
{
    doc = new XDocument();
    doc.Add(new XElement("Root"));
}
else
{
    doc = XDocument.Load(_file);
}

doc.Root.Add(
      new XElement("data",
                   new XElement("CompanyCode","C101"),
                   new XElement("ProductCode","P101")
            ) 
      );
doc.Save(_file);