I wrote code that checks if csgo is a running process, but its not updating

public void HookGame()
{
    Process[] processList = Process.GetProcesses();

    foreach (Process process in processList)
    {
        label2.Dispose();
        label3.Show();

        if (process.ProcessName.Contains("csgo"))
        {
            timer2.Start();
            label4.Text = "Csgo is running";
            this.label4.Location = new System.Drawing.Point(label4.Left = (this.Width - label4.Width), 200);
            label4.Show();
        }
        else
        {
            label4.Text = "Csgo is not running";
            this.label4.Location = new System.Drawing.Point(label4.Left = (this.Width - label4.Width), 200);
            Refresh();
            label4.Show();
        }
    }
}

I called the function on timer3 which is a 5000 interval timer.

private void timer3_Tick(object sender, EventArgs e)
{
    HookGame();
}    

Called the timer3 on the formload.

Ok the issue is when I open csgo, the timer2 starting which it should be, but the label text doesn't change, its weird tbh can someone help me about that?

I tried making label4 dispose and show again but didn't work

If an unhandled exception is thrown in a timer event handler in a Windows Forms app, it will stop the timer that raised the exception, and any subsequent timer events will not be raised until the timer is restarted.

It looks like the problem might be that you are disposing the label2 control many times which can cause an exception to be thrown.

Instead of disposing the control, you could try hiding it by setting its Visible property to false or just using Hide() method. You can also simplify the code by only updating the label text and location when the process is found and by finding process by name instead of iterating through all processes:

public void HookGame()
{
    Process[] processList = Process.GetProcessesByName("csgo");
    bool csgoFound = processList.Length > 0;

    label2.Hide();
    label3.Show();

    label4.Text = csgoFound ? "Csgo is running" : "Csgo is not running";
    label4.Location = new System.Drawing.Point(label4.Left = (this.Width - label4.Width), 200);
    label4.Show();
}

Note that you do not need to restart the timer if it has already been started because Timer implements a timer that raises an event at user-defined intervals.