C#

In C#, these are some common memory leaks:
•Not removing event listeners. Any event listener that is created with an anonymous method or lambda expression that references an outside object will keep those objects alive. Remember to remove event listeners when they are no longer used.

int m_it[MAX_BC];
int m_iKe[MAX_ROUNDS][MAX_BC];
char const* a_pchIn;
int* pi = m_it;
for(i=0; i<8; i++)
{
    *pi = ((unsigned char)*(a_pchIn++) << 24);
    *pi |= ((unsigned char)*(a_pchIn++) << 16);
    *pi |= ((unsigned char)*(a_pchIn++) << 8);
    (*(pi++) |= (unsigned char)*(a_pchIn++)) ^= m_iKe[0][i];
}

strHTML = "<table id='table1'> <colgroup><col width='190'/></colgroup><tbody>";
                for (int i = 0; i < objDs.Tables[0].Rows.Count; i++)
                {
                    if (i <= 10)
                    {
                        strUniqueID = "a" + i;
                        strBGColor = "a" + i.ToString();
                    }
                    else
                    {
                        strUniqueID = "a" + i;
                        strBGColor = "a" + (i - 1);
                    }
                    strSubject = objDs.Tables[0].Rows[i]["SubjectName"].ToString();
                    iSubjectID = Convert.ToInt32(objDs.Tables[0].Rows[i]["Subjectid"]);

<pre>
                strHTML = strHTML + &quot;&lt;tr&gt;&lt;td class=&#39;dark&#39;&gt;&lt;div id=&#39;&quot; + strUniqueID + &quot;&#39; class=&#39;drag clone &quot; + strBGColor + &quot;&#39;&gt;&quot; + strSubject + &quot;&lt;/div&gt;&lt;input id=&#39;b_&quot; + strUniqueID + &quot;&#39; class=&#39;&quot; + strUniqueID + &quot;&#39; type=&#39;button&#39; value=&#39;&#39; onclick=&#39;report(&quot; + strUniqueID + &quot;)&#39; title=&#39;Show only &quot; + strSubject + &quot;&#39;/&gt;&lt;/td&gt;&lt;/tr&gt;&quot;;

            }
            strHTML = strHTML + &quot;&lt;tr&gt;&lt;td class=&#39;trash&#39; title=&#39;Trash&#39;&gt;Trash&lt;/td&gt;&lt;/tr&gt;&quot;;
            strHTML = strHTML + &quot;&lt;/tbody&gt;&lt;/table&gt;&quot;;
            left.InnerHtml = strHTML;</pre>

public FormSplash()
{
  InitializeComponent();
  this.Text = String.Format("About {0}", AssemblyTitle);
  this.ApplicationTitle.Text = AssemblyProduct;
  this.Version.Text = String.Format("Version {0}", AssemblyVersion);
  this.Copyright.Text = AssemblyCopyright;
}

static public void ShowSplashScreen()
{
  // Make sure it's only launched once.
  if (ms_frmSplash != null)
    return;
  ms_oThread = new Thread(new ThreadStart(FormSplash.ShowForm));
  ms_oThread.IsBackground = true;
  ms_oThread.SetApartmentState(ApartmentState.STA);
  ms_oThread.Start();
  while (ms_frmSplash == null || ms_frmSplash.IsHandleCreated == false)
  {
    System.Threading.Thread.Sleep(TIMER_INTERVAL);<br />
  }
}

static public void ShowForm()
{
   ms_frmSplash = new FormSplash();
   Application.Run(ms_frmSplash);<br />
}

// Close the form without setting the parent.
static public void CloseForm()
{
  if (ms_frmSplash != null && ms_frmSplash.IsDisposed == false)
  {
    // Make it start going away. - I want to use ms_frmSplash.Close, but I get a object error
    ms_frmSplash.m_dblOpacityIncrement = -ms_frmSplash.m_dblOpacityDecrement; // I can't see this working
  }
  ms_oThread = null;  // we don't need these any more.
  ms_frmSplash = null;
}    

[STAThread]
static void Main()
{
  Application.EnableVisualStyles();
  Application.SetCompatibleTextRenderingDefault(false);

  FormSplash.ShowSplashScreen();
  FormSplash.CloseForm();
  Application.Run(new FormMain());      

}   

Application.Run(new FormMain());

<Data>
<baseImgUrl>http://thegamesdb.net/banners/</baseImgUrl>
<Game>
<id>5016</id>
<GameTitle>Final Fight</GameTitle>
<PlatformId>21</PlatformId>
<Platform>Sega CD</Platform>
<ReleaseDate>07/01/1993</ReleaseDate>
<Overview>
The Sega Mega CD version, titled Final Fight CD, was ported and published by Sega under license from Capcom in 1993. This version retains nearly all the features of the arcade game (namely the 2-player game mode, the Industrial Area stage, and the ability to play as any of the three main characters), adding voice acting to the game's opening and ending sequence, an arranged version of the original soundtrack, and an exclusive time attack mode. The Mega CD version was still censored for the English localization with many of the same changes. Poison and Roxy were kept this time, but were redrawn with less revealing clothing (longer shorts and shirts) to hide all nudity
</Overview>
<Genres>
<genre>Fighting</genre>
</Genres>
<Co-op>No</Co-op>
<Publisher>Sega</Publisher>
<Developer>Sega</Developer>
<Images>
<fanart>
<original width="1920" height="1080">fanart/original/5016-1.jpg</original>
<thumb>fanart/thumb/5016-1.jpg</thumb>
</fanart>
<boxart side="back" width="1530" height="2156" thumb="boxart/thumb/original/back/5016-1.jpg">boxart/original/back/5016-1.jpg</boxart>
<boxart side="front" width="1539" height="2156" thumb="boxart/thumb/original/front/5016-1.jpg">boxart/original/front/5016-1.jpg</boxart>
<clearlogo width="400" height="250">clearlogo/5016.png</clearlogo>
</Images>
</Game>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Collections;
using System.IO;
using System.Xml.Linq;
using System.Net;
namespace Collection
{
    public partial class search : Form
    {
        ArrayList ar;
        String Search_Query;
        public string id;
        public string selectedGame;

        public search()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Search_Query = textBox1.Text;
            URL_XML_Load();
        }

        public void URL_XML_Load()
        {

            XmlDocument doc = new XmlDocument();
            doc.Load("<a href="http://thegamesdb.net/api/GetGame.php?name=">http://thegamesdb.net/api/GetGame.php?name=</a>" + Search_Query);

            foreach (XmlNode node in doc.ChildNodes)
            {
                if (node.Name == "Data")
                {
                    foreach (XmlNode node_of_node in node.ChildNodes)
                    {
                        if (node_of_node.Name == "Game")
                        {
                            string Name = node_of_node["GameTitle"].InnerText;
                            listBox1.Items.Add(Name);

                        }

                    }
                }

            }
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            selectedGame = listBox1.SelectedItem.ToString();

        }