saving values in xml and retrieving them

raju patil

hello friends,
i have a 4 to 5 textboxes and 2buttons to save and retrieve the values back, after clicking on save button all the textbox values should be saved in xml file,and when i click on retrieve button the values from xml file should be retrieved in listbox or listview.

could someone please help me.....

6 Replies

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Vulpes12y ago
Accepted answer
Well, the code definitely works as I tried it myself before posting.

If it's creating an empty XML file then that suggests that the textboxes have not been placed on the form (as the code assumes) but are within some container such as a panel or groupbox.

If that's the case and the textboxes are in (say) panel1, change the code in btnSave_Click as follows:

private void btnSave_Click(object sender, EventArgs e)
{
XElement textBoxes = new XElement("textboxes");

// assumes all textboxes are in panel1
int count = panel1.Controls.Count;
for(int i = count - 1; i >= 0; i--)
{
Control c = panel1.Controls[i];

if (c is TextBox)
{
XElement textBox = new XElement("textbox");
textBox.Add(new XAttribute("name", c.Name));
textBox.Value = c.Text;
textBoxes.Add(textBox);
}
}

textBoxes.Save (filePath);
btnRetrieve.Enabled = true;
}
raju patil12y ago
Thanx Rajendra
raju patil12y ago
Thanx vulpes
Rajendra Tripathy12y ago

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Xml;

namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{
private const string FilePath = @"C:\xmlfile.xml";

public Form1()
{
InitializeComponent();
}

///
/// Save Values in XML
///
///
///
private void btnSaveValuesInXML_Click(object sender, EventArgs e)
{
// Creates an instance of the System.Xml.XmlTextWriter class using the specified file.
var textWriter = new XmlTextWriter(FilePath, null);
// Writes the XML declaration with the version "1.0".
textWriter.WriteStartDocument();
// Write comments
textWriter.WriteComment("First Comment for XmlTextWriter Sample Example");
// Write first element
textWriter.WriteStartElement("Student");
// textWriter.WriteStartElement("Document", "Test", "RECORD");
// Write next element Name
textWriter.WriteStartElement("Name");
textWriter.WriteString(textBox1.Text);
textWriter.WriteEndElement();
// Write element Address
textWriter.WriteStartElement("Address");
textWriter.WriteString(textBox2.Text);
textWriter.WriteEndElement();
// Write element Pincode
textWriter.WriteStartElement("Pincode");
textWriter.WriteString(textBox3.Text);
textWriter.WriteEndElement();
// Ends the document.
textWriter.WriteEndDocument();
// close writer
textWriter.Close();
MessageBox.Show(@"Values got stored in XML");
}

///
/// Retrieve Items
///
///
///
private void btnRetrieveItems_Click(object sender, EventArgs e)
{
var doc = new XmlDocument();
doc.Load(FilePath);

var nodeNames = new List();
var xmlNodeList = doc.SelectNodes("/Student");

// Normal Foreach Statement.
//if (xmlNodeList != null)
// foreach (System.Xml.XmlNode node in xmlNodeList)
// {
// foreach (System.Xml.XmlNode child in node.ChildNodes)
// {
// nodeNames.Add(child.InnerText);
// }
// }

// Linq Statement
if (xmlNodeList != null)
nodeNames.AddRange(from XmlNode node in xmlNodeList
from XmlNode child in node.ChildNodes
select child.InnerText);

foreach (var node in nodeNames)
{
listView1.Items.Add(node); // You can add SubItems for this also.
listBox1.Items.Add(node);
}

}
}
}
raju patil12y ago
It's creating empty xml file,

and while retrieving back the values its showing:
InvalidArgument=Value of '0' is not valid for 'SelectedIndex'.
Parameter name: SelectedIndex
Vulpes12y ago
Try this:

using System.Xml;
using System.Xml.Linq;

// ....

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
btnRetrieve.Enabled = false;
}

private string filePath = @"c:\myfiles\whatever.xml";

private void btnSave_Click(object sender, EventArgs e)
{
XElement textBoxes = new XElement("textboxes");

// assumes all textboxes placed directly on form
int count = this.Controls.Count;
for(int i = count - 1; i >= 0; i--)
{
Control c = this.Controls[i];

if (c is TextBox)
{
XElement textBox = new XElement("textbox");
textBox.Add(new XAttribute("name", c.Name));
textBox.Value = c.Text;
textBoxes.Add(textBox);
}
}

textBoxes.Save (filePath);
btnRetrieve.Enabled = true;
}

private void btnRetrieve_Click(object sender, EventArgs e)
{
XElement textBoxes = XElement.Load(filePath);
foreach (XElement textBox in textBoxes.Elements("textbox"))
{
listBox1.Items.Add(textBox.Value);
}
listBox1.SelectedIndex = 0;
}
}

If you're wondering why I'm iterating backwards through the controls collection to retrieve the textbox values, that's because (for some unknown reason) the VS designer adds them to the collection in the reverse order they were added to the form.