C#

using (StreamWriter writer = new StreamWriter("C:\\log.csv", true)) //add ,true to this to append
            {
                writer.WriteLine(textBox1.Text + "," + System.DateTime.Now);
                
            }                

Luc Pattyn wrote:

No problem[^].

Ravi Bhavnani wrote:

collector's haven for Dinky Toys

using System;
using System.Windows.Forms;
using System.IO;

namespace WriteCSV
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.timer1.Enabled = !this.timer1.Enabled;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            FileStream fs = new FileStream("test.csv",  FileMode.Append, FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs);
            sw.WriteLine(DateTime.Now.ToString());
            sw.Close();
            fs.Close();
        }
    }
}