C#

for (i=0; i < ...) {
   btnArr[i].Click += new System.EventHandler(NameOfYourClickHandler);
   btnArr[i].Tag = i; // this is needed so that you can identify which
                      // button was clicked
}

public void NameOfYourClickHandler(object sender, System.EventArgs e) {
   // do something
   MessageBox.Show(((System.Windows.Button)sender).Tag.ToString());
}

Process oProcess = new Process();
oProcess.StartInfo.Arguments = "D:\\Temp\\MyFile.txt"; //File to open (sent as a command line argument)
oProcess.StartInfo.FileName = "notepad.exe"; //Application to open the file in
oProcess.Start();

char cQuote = Convert.ToChar(34);
Process.Start("excel.exe", cQuote + Path + "\\" + FileName + ".xml" + cQuote);

ResourceManager res = new ResourceManager("MyResourceProject.Properties.Resources", Assembly.GetExecutingAssembly());
picBoxLine.Image = (System.Drawing.Image) res.GetObject("Res" + n.ToString());