C#

private void button2_Click(object sender, System.EventArgs e)
{
richTextBox1.SelectionFont=new Font(richTextBox1.SelectionFont, 
richTextBox1.SelectionFont.Style ^ FontStyle.Underline);
}

int pos=richTextBox1.Text.IndexOf("Hello");
if(pos != -1)
{
    richTextBox1.Select(pos,"Hello".Length);
    richTextBox1.SelectionFont=new Font  (richTextBox1.SelectionFont, 
richTextBox1.SelectionFont.Style ^ FontStyle.Underline);
}

<code>
public class Test
{
private string firstName;
private string Lastname;
private string fullName;
public Test(string fn,string ln)
{ 
  firstName=fn;
  Lastname=ln;
}
//Property to return value
public string FullNameProp
{
   get
   {
      return fullName;
    }
}
//Your Thread function
public void FullName()
{
  fullName=firstName + " " + lastName;
}
}
</code>

<br />
Thread worker = new Thread(new ThreadStart(FullName)); // create Thread<br />
worker.Start(); // start Thread<br />

<br />
using System;<br />
using System.Threading;<br />
<br />
namespace MyConsoleThread<br />
{<br />
	/// <summary><br />
	/// Summary description for MyThread.<br />
	/// </summary><br />
	class ThreadMain<br />
	{<br />
		/// <summary><br />
		/// The main entry point for the application.<br />
		/// </summary><br />
		[STAThread]<br />
		static void Main(string[] args)<br />
		{<br />
			//<br />
			// TODO: Add code to start application here<br />
			//<br />
			MyThread thread1 = new MyThread();<br />
			Thread[] ta = new Thread[100]; // Thread-Array<br />
<br />
			for (int j = 0; j<10; j++)<br />
			{<br />
				ta[j] = new Thread(new ThreadStart(thread1.start)); // Thread wird erzeugt<br />
				ta[j].Start(); // Thread wird gestartet<br />
			}<br />
<br />
			System.Console.ReadLine();<br />
		}<br />
	}<br />
<br />
	class MyThread<br />
	{<br />
		public int i=0;<br />
		public Object lockvar = ""; // Lock-Variable<br />
<br />
<br />
		public void start()<br />
		{<br />
			Monitor.Enter(lockvar);<br />
			String mystring = "Thread gestartet ";<br />
			i++;<br />
			mystring += i;<br />
			System.Console.WriteLine(mystring);<br />
			Monitor.Exit(lockvar);<br />
		}<br />
	}<br />
}<br />

for(int i = 0; i<100; ++i) thread1.start();