[C# 2.0] Get and Check Daylight Saving Time (DST)

Here is the way to get the DST:

using System.Globalization;

public static DataTable GenerateDST(int startYear, int endYear)
{
    DataTable dt = new DataTable();
    //get the current timezone
    TimeZone oTimeZone = TimeZone.CurrentTimeZone;
    DaylightTime oDST;

    dt.Columns.Add("Year");
    dt.Columns.Add("Start Date");
    dt.Columns.Add("End Date");

    for (int i = startYear; i <= endYear; i++)
    {
        oDST = oTimeZone.GetDaylightChanges(i);
        dt.Rows.Add(oDST.Start.Year, oDST.Start.ToShortDateString(), oDST.End.ToShortDateString());
    }

    oTimeZone = null;
    oDST = null;

    return dt;
}

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[C#]My simple version of Captcha

This is my own version of Captcha. It's easy and simple. You can improve it with your ideas or needs.

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[C#][WinForm]Prevent same process to be executed more than once at the same time: a simple approach

This is a simple and easy way to do it if your requirement is simple. Otherwise you should use Mutex.

using System.Diagnostics;

private void Form1_Load(object sender, EventArgs e)
{
    try
    {
        string strModuleName = Process.GetCurrentProcess().MainModule.ModuleName;
        string strProcessName = Path.GetFileNameWithoutExtension(strModuleName);
        Process[] aryProcess = Process.GetProcessesByName(strProcessName);

        if (aryProcess.Length > 1)
        {
            MessageBox.Show("This program is running already!");
            this.Close();
        }

        //...
    }
    catch (Exception ex)
    {
        //...
    }
}

Note: This will check the process based on the filename. It will not work if the filename is different. For example, if you make a copy of your program (let's say FindMP3.exe) and rename it to a different name like FindMP3_1.exe. That means, people can run FindMP3.exe and FindMP3_1.exe at the same time.

You can find other approaches from here.

[C#]Simple windows registry manipulation

using Microsoft.Win32;

//Attempt to open the key.
RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Software\Play\WindowPosition");

//The key doesn't exist if it returns null.
if (key == null)
{
    //Create & open it.
    key = Registry.CurrentUser.CreateSubKey(@"Software\Play\WindowPos");
    key.SetValue("PositionX", Location.X);
    key.SetValue("PositionY", Location.Y);
}
else
{
    //Get value
    Location.X = key.GetValue("PositionX");
    Location.Y = key.GetValue("PositionY");
}

GetWords

Name: GetWords
Version: 1.3
Platform: Windows with .Net Framework 2.0 installed
Introduction:
Fetch words from the given article. It will fetch, sort, remove duplicated words. It will ignore the word that less than 3 characters like am, is, as... etc.
How to use:
1.Paste anything you want to parse on the left-hand side textbox.
2.Click the "Get Words!" button, and the result will show on the right-hand side.