c# How can I call a void after another void?

Question

I have two voids that have to be called after one another every 5 seconds.I mean first the first void has to be called and after that the second void has to be called and the we have 5 seconds break...but my program only calls the first void(get pressure) and ignores the second one....could anyone show me the code?

private void getPressure()
{
    if (serialPort1.IsOpen)
    {
        string PCR = "";
        byte[] readCommand = { 0x50, 0x0D };
        serialPort1.Write(readCommand, 0, 2);
        int bytestoread = serialPort1.BytesToRead;
        if (bytestoread > 0)
        {
            byte[] input = new byte[bytestoread];
            serialPort1.Read(input, 0, bytestoread);
            PCR = System.Text.Encoding.UTF8.GetString(input);
        }
        if (PCR.StartsWith("P"))
        {
            if (PCR.Length > 15)
            {
                PCR = PCR.Substring(3, PCR.IndexOf("T") - 3).Trim();
                var decPCR = Decimal.Parse(PCR, NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint);
                rTxtBoxPressure.Text = decPCR + " Torr";
                double data;
                bool result = Double.TryParse(decPCR.ToString(), out data);
                if (result)
                {
                    serialDataChart.TriggeredUpdate(data);
                }
            }
        }
    }
}
    
private void getVoltage()
{
    if (serialPort1.IsOpen)
    {
        string UCR = "";
        byte[] readCommand2 = { 0x55, 0x0D };
        serialPort1.Write(readCommand2, 0, 2);
        int bytestoread2 = serialPort1.BytesToRead;
        if (bytestoread2 > 0)
        {
            byte[] input2 = new byte[bytestoread2];
            serialPort1.Read(input2, 0, bytestoread2);
            UCR = System.Text.Encoding.UTF8.GetString(input2);
        }
        if (UCR.StartsWith("V"))
        {
            if (UCR.Length > 15)
            {
                UCR = UCR.Substring(5, UCR.IndexOf("Volts") - 5).Trim();
                var decUCR = Decimal.Parse(UCR, NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint);
                rtxtBoxVoltage.Text = decUCR + " Volts";
                double data;
                bool result = Double.TryParse(decUCR.ToString(), out data);
                if (result)
                {
                    serialDataChart2.TriggeredUpdate(data);
                }
            }
        }
    }
}
    
private void InitTimer()
{
    timer1 = new Timer();
    timer1.Tick += new EventHandler(timer1_Tick);
    timer1.Interval =5000;
    timer1.Start();
}
            
    
private void timer1_Tick(object sender , EventArgs e)
{
    getPressure();
    getVoltage();
}

Answer 1

First of all, you define your time with Interval = 5000 , which will trigger timer event every 5 seconds.

Secondly, in timer event handler you call desired methods one after another, without any interval, so once getPressure finishes, getVoltage starts immediately.

So, to sum it up - you don't need timer, as in your requirements I don't see that both functions should be called periodically. The only thing we need to call one, and then after 2 seconds call another, so I'd suggest something among the lines

getPressure();
// wait two seconds between calls, you could also use Thread.Sleep(2 * 1000)
await Task.Delay(2 * 1000);
getVoltage();

IF you want to wait 2 seconds before calling getVoltage , but it should be 2 seconds from starting getPressure , then the code should look like:

var pressureTask = Task.Run(() => getPressure());
await Task.Delay(2 * 1000);
getVoltage();

await pressureTask;