How to working with xml in .net?

XmlDocument and XmlDataDocument are a classes which is used to work with xml doucments in the form of memory objects.

XmlDocument:

xmlDocument is an in-memory object which loads the entire document into memory then perform the requried operations.

How to Load an xml file to XmlDocument Class?

XmlDocument loads the xml file as a in-memory.to load the xml file to in memory this object has 2 ways

1.  Load(string filename)

2.  LoadXml(“<book><id>1</id></book>”);

Class Declaration:

XmlDocument xmldoc;      XmlNode n;

Under Load Button

xmldoc = new XmlDocument();

            xmldoc.Load(textBox1.Text);

         

Then xmlDocument load the data. As in MEMORY.

Then Find the data.now data is available as IN-MEMORY.

Then we have 2 methods to pointing a particular elements in the xml document using xpath so we have 2 methods like

SingleNodes

SelectSinglNode accepts xpath query to retrive particular data to memory.

Like

private void Find(object sender, EventArgs e)

{         

           n = xmldoc.SelectSingleNode(@"/NewDataSet/jobs[job_id="+Convert.ToInt32(textBox6.Text)+"]");                       

            if(n!=null)

            {                  

                    textBox2.Text=n.ChildNodes[0].InnerText;

                    textBox3.Text=n.ChildNodes[1].InnerText;

                    textBox4.Text=n.ChildNodes[2].InnerText;

                    textBox5.Text=n.ChildNodes[3].InnerText;

            }

            else

                MessageBox.Show("absent today");

        }

Now here n pointing particular data.

How to retrive data of a particular Element ?

Under GetNames

private void GetNames(object sender, EventArgs e)

{

            listBox1.Items.Clear();

             XmlNodeList nl=xmldoc.GetElementsByTagName("job_desc");

           

                foreach (XmlNode n in nl)

                {

                    listBox1.Items.Add(n.InnerText);

                   

                }  

}

How to   save   the data after modifications in xml file(document)?

private void save(object sender, EventArgs e)

        {// after n is find, then n----->pointing to a node save modification of THAT** childnods is possible.

            n.ChildNodes[1].InnerText = textBox3.Text;

            n.ChildNodes[2].InnerText = textBox4.Text;

            n.ChildNodes[3].InnerText = textBox5.Text;

            MessageBox.Show("Data Modified");

          xmldoc.Save(textBox1.Text);

            GetNames(sender, e);

        }

How to Delete the data from the xml document?

private void Delete(object sender, EventArgs e)

{

          xmldoc.DocumentElement.RemoveChild(n);            

            xmldoc.Save(textBox1.Text);

            GetNames(sender, e);

}