Automatic control of a textBox each period

See more:

C#

C#4.0

Hello, I am a beginner in c #. I want to make a function that captures
the contents of a text file by checking in a textBox
text content every 2 minutes.when the value entered in the textBox is equal to 1 an alarm will be triggered. I managed to capture content of the text file in the texteBox. when it equal to 1 is an alarm declenche.My problem is how to control this textBox every 2 minutes.here my code:

using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Media;

namespace streamReader
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
//Creating a new stream-reader and opening the file.
System.IO.StreamReader StreamReader1 = new System.IO.StreamReader(@"..//..//déclenche priorité//priorité.txt");

//Reading Line from file
string newLine;
while ((newLine = StreamReader1.ReadLine()) != null)


//Writing the read line to textBox
textBox1.AppendText(newLine);

//Close the file
StreamReader1.Close();
}






private void textBox1_TextChanged(object sender, EventArgs e)
{


if (textBox1.Text == "1")
{
SoundPlayer player = new SoundPlayer();
string chemin = "..//..//Sequences//alarme.wav";
player.SoundLocation = chemin;
player.Play();
}

}


}
}

thank you for helping me