Form1.cs

using System.Configuration;

namespace project
{
    public partial class Form1 : Form
    {
        
        public Form1()
        {
            InitializeComponent();
            textBox2.PasswordChar = '*';
            myFile = new FileStream(myFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            myStreamReader = new StreamReader(myFile);
        }
        public static FileStream myFile;
        public static StreamReader myStreamReader;
        string myFileName = "userData.txt";
        public StreamReader GetStreamReader()
        {
            return myStreamReader;
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void boo_Click(object sender, EventArgs e)
        {
            
            myStreamReader.BaseStream.Seek(0, SeekOrigin.Begin);
            long startPosition = 0;
            string record;
            string[] fields;
            bool userFound = false;
            startPosition = myStreamReader.BaseStream.Position;
            while ((record = myStreamReader.ReadLine()) != null)
            {
                fields = record.Split(",");
                // Check if username and password match
                if (textBox1.Text == fields[2] && textBox2.Text == fields[3])
                {
                    userFound = true;
                    startPosition = myStreamReader.BaseStream.Position - record.Length - 2; // Adjust for line terminator
                    break;
                }
                startPosition = myStreamReader.BaseStream.Position;
            }

            if (userFound)
            {
                fields = record.Split(",");
                admin admin = new admin();
                admin.FirstName = fields[0];
                admin.LastName = fields[1];
                admin.StartPosition = startPosition;
                admin.Show();
                this.Hide();
            }
            else
            {
                MessageBox.Show("Wrong User Name or password");
            }
        }

            private void button1_Click(object sender, EventArgs e)
        {
            myFile.Close();
            signIn signIn = new signIn();
            signIn.Show();
            this.Hide();

        }
    }
}