LogForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MoyaSignup
{
    public partial class LogForm : Form
    {
        public LogForm()
        {
            InitializeComponent();
        }

        public void WriteLogLine(string line)
        {
            logTextBox.Text += line + "\r\n";
            logTextBox.Focus();
            logTextBox.SelectionStart = logTextBox.Text.Length - 1;
            logTextBox.SelectionLength = 0;
        }

        private void logTextBox_TextChanged(object sender, EventArgs e)
        {

        }
    }
}