Writing XML with the XmlWriter Class


   


using System;
using System.IO;
using System.Xml;
   
class MainClass
{
    static public void Main()
    {
        XmlTextWriter XmlWriter = new XmlTextWriter(Console.Out);
        
        XmlWriter.WriteStartDocument();
        XmlWriter.WriteComment("This is the comments.");
        XmlWriter.WriteStartElement("BOOK");
        XmlWriter.WriteElementString("TITLE", "this is the title.");
        XmlWriter.WriteElementString("AUTHOR", "I am the author.");
        XmlWriter.WriteElementString("PUBLISHER", "who is the publisher");
        XmlWriter.WriteEndElement();
        XmlWriter.WriteEndDocument();
    }
}
           
          


Convert an XmlNode to an object

   
 
#region License and Copyright
/*
 * Dotnet Commons Xml
 *
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
 * for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the 
 * Free Software Foundation, Inc., 
 * 59 Temple Place, 
 * Suite 330, 
 * Boston, 
 * MA 02111-1307 
 * USA 
 * 
 */
#endregion

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.Serialization;

//using Dotnet.Commons.Reflection;

namespace Dotnet.Commons.Xml
{
  
  ///  
  /// <summary>
  /// This utility class contains wrapper functions that help to ease the handling and 
    /// manipulation of Xml documents, such as adding an element, adding an attribute
    /// to an element, copying and cloning of nodes, etc.
  ///
  /// </summary>
  /// 
    
  public abstract class XmlUtils
  {
    /// <summary>
    /// Convert an XmlNode to an object
    /// </summary>
    /// <param name="node"></param>
    /// <param name="targetObj"></param>
    /// <returns></returns>
    /// -----------------------------------------------------------
    public static object FromXmlNodeWithAttributes(XmlNode node, object targetObj)
    {
      if (node.Attributes.Count == 0)
        return targetObj;

      foreach( XmlAttribute attr in node.Attributes)
      {
        string propertyName = attr.Name;
        string propertyValue = attr.Value;

                PropertyInfo pi = targetObj.GetType().GetProperty(propertyName);

                if (pi != null)
                    pi.SetValue(targetObj, Convert.ChangeType(propertyValue, pi.PropertyType), null);

                else // search if such field exists
                {
                    FieldInfo fi = targetObj.GetType().GetField(propertyName);

                    if (fi != null)
                        fi.SetValue(targetObj, Convert.ChangeType(propertyValue, fi.FieldType));                        
                }
      }

      return targetObj;
    }

    }
}

   
     


Alphabetical sorting of the XmlNodes

#region License and Copyright
/*
* Dotnet Commons Xml
*
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place,
* Suite 330,
* Boston,
* MA 02111-1307
* USA
*
*/
#endregion

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.Serialization;

//using Dotnet.Commons.Reflection;

namespace Dotnet.Commons.Xml
{

///
///

/// This utility class contains wrapper functions that help to ease the handling and
/// manipulation of Xml documents, such as adding an element, adding an attribute
/// to an element, copying and cloning of nodes, etc.
///
///

///

public abstract class XmlUtils
{
// #################################################################### //
// These code is derived from Mainsoft.com //
// http://www.koders.com/csharp/fid439BB5BEF93D1AEFAF0B9206236AB0ECE49BC229.aspx
// #################################################################### //

/// ———————————————————–
///

/// Alphabetical sorting of the XmlNodes
/// and their attributes in the .
///

/// to be sorted /// ———————————————————–
public static void SortXml(XmlDocument document)
{
SortXml(document.DocumentElement);
}

/// ———————————————————–
///

/// Inplace pre-order recursive alphabetical sorting of the XmlNodes child
/// elements and .
///

/// The root to be sorted. /// ———————————————————–
public static void SortXml(XmlNode rootNode)
{
SortAttributes(rootNode.Attributes);
SortElements(rootNode);
foreach (XmlNode childNode in rootNode.ChildNodes)
{
SortXml(childNode);
}
}

/// ———————————————————–
///

/// Sorts an attributes collection alphabetically.
/// It uses the bubble sort algorithm.
///

/// The attribute collection to be sorted. /// ———————————————————–
public static void SortAttributes(XmlAttributeCollection attribCol)
{
if (attribCol == null)
return;

bool hasChanged = true;
while (hasChanged)
{
hasChanged = false;
for (int i = 1; i < attribCol.Count; i++) { if (String.Compare(attribCol[i].Name, attribCol[i-1].Name, true) < 0) { //Replace attribCol.InsertBefore(attribCol[i], attribCol[i - 1]); hasChanged = true; } } } } /// ----------------------------------------------------------- ///

/// Sorts a alphabetically, by the names of the elements.
/// It uses the bubble sort algorithm.
///

/// The node in which its childNodes are to be sorted. /// ———————————————————–
public static void SortElements(XmlNode node)
{
bool changed = true;
while (changed)
{
changed = false;
for (int i = 1; i < node.ChildNodes.Count; i++) { if (String.Compare(node.ChildNodes[i].Name, node.ChildNodes[i-1].Name, true) < 0) { //Replace: node.InsertBefore(node.ChildNodes[i], node.ChildNodes[i-1]); changed = true; } } } } } } [/csharp]

Set the value to the Element

   
 
#region License and Copyright
/*
 * Dotnet Commons Xml
 *
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
 * for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the 
 * Free Software Foundation, Inc., 
 * 59 Temple Place, 
 * Suite 330, 
 * Boston, 
 * MA 02111-1307 
 * USA 
 * 
 */
#endregion

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.Serialization;

//using Dotnet.Commons.Reflection;

namespace Dotnet.Commons.Xml
{
  
  ///  
  /// <summary>
  /// This utility class contains wrapper functions that help to ease the handling and 
    /// manipulation of Xml documents, such as adding an element, adding an attribute
    /// to an element, copying and cloning of nodes, etc.
  ///
  /// </summary>
  /// 
    
  public abstract class XmlUtils
  {
    /// -----------------------------------------------------------
    /// <summary>
    /// Set the value to the Element
    /// </summary>
    /// <param name="node">the node to set the value </param>
    /// <param name="nodeValue">Value to set</param>
    /// <exception cref="XmlException">
    ///    Thrown if XmlNode is not an element or node is 
    ///    not a text node (no child nodes)
    ///  </exception>
    /// -----------------------------------------------------------
    public static void SetNodeValue( XmlNode node, object nodeValue )
    {  
      if (node == null)
        throw new ArgumentNullException("node");

      if (node.NodeType != XmlNodeType.Element)
        throw new XmlException("Node is not an element.");

      if (node.ChildNodes.Count > 0)
        throw new XmlException("Node is not a text node as it has child nodes.");

      node.AppendChild(node.OwnerDocument.CreateTextNode(nodeValue.ToString()));
    }

    /// ------------------------------------------------------------------
    /// <summary>
    /// Set the value to a node
    /// </summary>
    /// <param name="parentNode">parentNode to start search from</param>
    /// <param name="xpath">XPath to the child node</param>
    /// <param name="nodeValue">the new value to set to</param>
    /// <exception cref="ArgumentNullException">Thrown if parentNode is null</exception>
    /// <exception cref="ArgumentException">Thrown if no text node is found at the xpath provided.</exception>
    /// <exception cref="XmlException">Thrown if node to set the value is not a text node (ie. no child nodes)</exception>
    /// ------------------------------------------------------------------
    public static void SetNodeValue(XmlNode parentNode, 
                    string xpath, 
                    object nodeValue)
    {
      if (parentNode == null)
        throw new ArgumentNullException("parentNode");

      XmlNode childNode = parentNode.SelectSingleNode(xpath);
      
      if(childNode == null)
        throw new ArgumentException(String.Format("No node is not found at the path specified &#039;{0}&#039;", xpath), "xpath");
      
      if (childNode.ChildNodes.Count > 0)
        throw new XmlException("Child node is not a text node as it has child nodes.");

      childNode.InnerText = nodeValue.ToString();
      
    }

    /// -----------------------------------------------------------
    /// <summary>
    /// Set a blog of binary data encoded with Base64 to an XML element.
    /// </summary>
    /// <param name="node">the node to set the blog of data</param>
    /// <param name="byteArray">an array of bytes containing the actual data</param>
    /// <exception cref="XmlException">Thrown if XmlNode is not an element or 
    ///    node is not a text node (no child nodes)</exception>
    /// -----------------------------------------------------------
    public static void SetNodeBase64BinaryValue( XmlNode node, byte[] byteArray )
    {
      if (node.NodeType != XmlNodeType.Element)
        throw new XmlException("Node is not an element.");

      if (node.ChildNodes.Count > 0)
        throw new XmlException("Node is not a text node as it has child nodes.");

      // Convet byte array into Base64 string
      string encodedData = Convert.ToBase64String(byteArray);
      
      node.AppendChild(node.OwnerDocument.CreateTextNode(encodedData));
    }


    /// -----------------------------------------------------------
    /// <summary>
    /// Encode a value to Base64 and set it to the node.
    /// </summary>
    /// <param name="node">the node to set the value</param>
    /// <param name="value">value to set to the node</param>
    /// <exception cref="XmlException">Thrown if XmlNode is not an element 
    /// or node is not a text node (no child nodes)</exception>
    /// -----------------------------------------------------------
    public static void SetNodeBase64EncodedValue( XmlNode node, object value)
    {
      if (value is byte[])
        SetNodeBase64BinaryValue(node, (byte[])value);

      if (node.NodeType != XmlNodeType.Element)
        throw new XmlException("Node is not an element.");

      if (node.ChildNodes.Count > 0)
        throw new XmlException("Node is not a text node as it has child nodes.");

      // Convet byte array into Base64 string
      ASCIIEncoding encoding = new ASCIIEncoding();
      byte[] bytes = encoding.GetBytes(value.ToString());

      SetNodeBase64BinaryValue(node, bytes);      
    }
    }
}

   
     


Get the Xml Text node value

   
 
#region License and Copyright
/*
 * Dotnet Commons Xml
 *
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
 * for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the 
 * Free Software Foundation, Inc., 
 * 59 Temple Place, 
 * Suite 330, 
 * Boston, 
 * MA 02111-1307 
 * USA 
 * 
 */
#endregion

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.Serialization;

//using Dotnet.Commons.Reflection;

namespace Dotnet.Commons.Xml
{
  
  ///  
  /// <summary>
  /// This utility class contains wrapper functions that help to ease the handling and 
    /// manipulation of Xml documents, such as adding an element, adding an attribute
    /// to an element, copying and cloning of nodes, etc.
  ///
  /// </summary>
  /// 
    
  public abstract class XmlUtils
  {
    /// -------------------------------------------------------------------
    /// <summary>
    /// Get the Xml Text node value
    /// </summary>
    /// <param name="parentNode"></param>
    /// <param name="xPath"></param>
    /// <returns></returns>
    /// -------------------------------------------------------------------
    public static string GetTextNodeValueFromXPath(XmlNode parentNode, 
                             string xPath)
    {
      XmlNode node = parentNode.SelectSingleNode(xPath);

      if (node == null)
        return String.Empty;

      if (node.NodeType == XmlNodeType.Text || node.NodeType== XmlNodeType.Attribute)
        return node.Value;

      if (node.NodeType == XmlNodeType.Element)
      {        
        try
        {  
          if (node.FirstChild.NodeType == XmlNodeType.Text)
            return node.InnerText;
        }
        catch 
        { //Do Nothing 
        }
      }
      return String.Empty;
    }
    }
}

   
     


Create an element type XmlNode like text value

   
 

#region License and Copyright
/*
 * Dotnet Commons Xml
 *
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
 * for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the 
 * Free Software Foundation, Inc., 
 * 59 Temple Place, 
 * Suite 330, 
 * Boston, 
 * MA 02111-1307 
 * USA 
 * 
 */
#endregion

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.Serialization;

//using Dotnet.Commons.Reflection;

namespace Dotnet.Commons.Xml
{
  
  ///  
  /// <summary>
  /// This utility class contains wrapper functions that help to ease the handling and 
    /// manipulation of Xml documents, such as adding an element, adding an attribute
    /// to an element, copying and cloning of nodes, etc.
  ///
  /// </summary>
  /// 
    
  public abstract class XmlUtils
  {
    /// -----------------------------------------------------------
    /// <summary>
    /// Create an element type XmlNode like
    /// </summary>
    /// <param name="xmldoc"></param>
    /// <param name="nodeName"></param>
    /// <param name="nodeValue"></param>
    /// <param name="namespaceURI"></param>
    /// <returns>an XmlNode of element type</returns>
    /// -----------------------------------------------------------
    public static XmlNode CreateTextElementNode(XmlDocument xmldoc, 
                          string nodeName, 
                          object nodeValue, 
                          string namespaceURI)
    {
      XmlNode aNode = xmldoc.CreateElement(nodeName, namespaceURI);

      if (nodeValue != null)
        aNode.AppendChild(xmldoc.CreateTextNode(nodeValue.ToString()));
      
      return aNode;
    }
    /// -------------------------------------------------------------------
    /// <summary>
    /// Create an element that holds a blog of data in Base64 format. 
    /// The blog of data is passed in as an array of byte.    
    /// </summary>
    /// <param name="xmldoc"></param>
    /// <param name="nodeName">name of the node in which the data is to be held under</param>
    /// <param name="inputBytes">blog of data to be converted to Base64</param>
    /// <param name="namespaceURI"></param>
    /// <returns></returns>
    /// -------------------------------------------------------------------
    public static XmlNode CreateBase64ElementNode(XmlDocument xmldoc, 
                            string nodeName, 
                            byte[] inputBytes, 
                            string namespaceURI)
    {

      // Convet byte array into Base64 string
      string encodedData = Convert.ToBase64String(inputBytes);
      
      return CreateTextElementNode(xmldoc, nodeName, encodedData, namespaceURI);
    }
    }
}    

   
     


Load XML file to DataTable then add DataTable to ListView


   

/*
<?xml version="1.0" standalone="yes"?>
<NewDataSet>
  <Employee>
    <ID>8</ID>
    <Name>Joe</Name>
  </Employee>
</NewDataSet>
*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form
{
    private System.Windows.Forms.Button cmdFillList;
    private System.Windows.Forms.ListView listView;
    private System.Windows.Forms.CheckBox chkGroups;
      public Form1() {
            InitializeComponent();
      listView.View = View.Tile;
      listView.TileSize = new Size(300, 50);
      FillList();
      }
    public static DataTable GetProducts()
    {
      DataSet dsStore = new DataSet();
      dsStore.ReadXml("myXmlFile.xml");
      return dsStore.Tables["Employee"];
    }

    public static DataTable GetCategories()
    {
      DataSet dsStore = new DataSet();
      dsStore.ReadXml("myXmlFile.xml");
      return dsStore.Tables["Employee"];
    }

    private void cmdFillList_Click(object sender, EventArgs e)
    {
      FillList();
    }

    private void FillList()
    {
      listView.Items.Clear();

      if (listView.Groups.Count == 0)
      {
        DataTable dtGroups = GetCategories();
        foreach (DataRow dr in dtGroups.Rows)
        {
          listView.Groups.Add(dr["ID"].ToString(), dr["Name"].ToString());
        }
      }
      listView.ShowGroups = chkGroups.Checked;

      DataTable dtProducts = GetProducts();

      listView.BeginUpdate();

      foreach (DataRow dr in dtProducts.Rows)
      {
        ListViewItem listItem = new ListViewItem(dr["Name"].ToString());
        listItem.ImageIndex = 0;

        listItem.Group = listView.Groups[dr["ID"].ToString()];

        listItem.SubItems.Add(dr["ID"].ToString());

        listView.Items.Add(listItem);
      }

      if (listView.Columns.Count == 0)
      {
        listView.Columns.Add("Product", 100, HorizontalAlignment.Left);
        listView.Columns.Add("ID", 100, HorizontalAlignment.Left);
        listView.Columns.Add("Description", 100, HorizontalAlignment.Left);
      }
      listView.EndUpdate();
    }

    private void NewView(object sender, System.EventArgs e)
    {
      listView.View = (View)(((Control)sender).Tag);
    }

    private void listView_ColumnClick(object sender, ColumnClickEventArgs e)
    {
      ListViewItemComparer sorter = listView.ListViewItemSorter as ListViewItemComparer;

      if (sorter == null)
      {
        sorter = new ListViewItemComparer(e.Column);
        listView.ListViewItemSorter = sorter;
      } else {
        if (sorter.Column == e.Column &amp;&amp; !sorter.Descending)
        {
          sorter.Descending = true;
          listView.Sorting = SortOrder.Descending;        
        }
        else
        {
          listView.Sorting = SortOrder.Ascending;
          sorter.Descending = false;
          sorter.Column = e.Column;
        }
      }  
      listView.Sort();
    }

    private void cmdResizeColumns_Click(object sender, EventArgs e)
    {
      listView.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);
    }


    private void listView_SelectedIndexChanged(object sender, EventArgs e)
    {
      if (listView.SelectedItems.Count > 0)
        Console.WriteLine(listView.SelectedItems[0].SubItems[2].Text);
    }

    private void chkGroups_CheckedChanged(object sender, EventArgs e)
    {
      FillList();
    }
    private void InitializeComponent()
    {
      this.cmdFillList = new System.Windows.Forms.Button();
      this.listView = new System.Windows.Forms.ListView();
      this.chkGroups = new System.Windows.Forms.CheckBox();
      this.SuspendLayout();
      // 
      // cmdFillList
      // 
      this.cmdFillList.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
      this.cmdFillList.FlatStyle = System.Windows.Forms.FlatStyle.System;
      this.cmdFillList.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
      this.cmdFillList.Location = new System.Drawing.Point(269, 195);
      this.cmdFillList.Name = "cmdFillList";
      this.cmdFillList.Size = new System.Drawing.Size(114, 24);
      this.cmdFillList.TabIndex = 7;
      this.cmdFillList.Text = "Fill List";
      this.cmdFillList.Click += new System.EventHandler(this.cmdFillList_Click);
      // 
      // listView
      // 
      this.listView.AllowColumnReorder = true;
      this.listView.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
            | System.Windows.Forms.AnchorStyles.Left)
            | System.Windows.Forms.AnchorStyles.Right)));
      this.listView.FullRowSelect = true;
      this.listView.GridLines = true;
      this.listView.Location = new System.Drawing.Point(7, 8);
      this.listView.MultiSelect = false;
      this.listView.Name = "listView";
      this.listView.Size = new System.Drawing.Size(254, 282);
      this.listView.Sorting = System.Windows.Forms.SortOrder.Ascending;
      this.listView.TabIndex = 6;
      this.listView.SelectedIndexChanged += new System.EventHandler(this.listView_SelectedIndexChanged);
      this.listView.ColumnClick += new System.Windows.Forms.ColumnClickEventHandler(this.listView_ColumnClick);

      this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
      this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
      this.ClientSize = new System.Drawing.Size(390, 381);
      this.Controls.Add(this.listView);
      this.Controls.Add(this.cmdFillList);
      this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
      this.Name = "Form1";
      this.Text = "ListView Example";
      this.ResumeLayout(false);
      this.PerformLayout();

    }

  [STAThread]
  static void Main()
  {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
  }

}
  public class ListViewItemComparer : System.Collections.IComparer
  {
    private int column;
    public int Column
    {
      get { return column; }
      set { column = value; }
    }

    private bool numeric = false;
    public bool Numeric
    {
      get { return numeric; }
      set { numeric = value; }
    }

    private bool descending = false;
    public bool Descending
    {
      get { return descending; }
      set { descending = value; }
    }

    public ListViewItemComparer(int columnIndex)
    {
      Column = columnIndex;
    }

    public int Compare(object x, object y)
    {
      ListViewItem listX, listY;
      if (descending)
      {
        listY = (ListViewItem)x;
        listX = (ListViewItem)y;
      }
      else
      {
        listX = (ListViewItem)x;
        listY = (ListViewItem)y;
      }

      if (Numeric)
      {
        decimal valX, valY;
        Decimal.TryParse(listX.SubItems[Column].Text, out valX);
        Decimal.TryParse(listY.SubItems[Column].Text, out valY);

        return Decimal.Compare(valX, valY);
      }
      else
      {
        return String.Compare(
          listX.SubItems[Column].Text, listY.SubItems[Column].Text);
      }
    }
  }