private void button1_Click(object sender, EventArgs e)
 {
     bool found = false;
     for (int i = 0; i < userList.Count; i++)
     {
         if(textBox1.Text.Equals(userList[i].username))
         {
             string pwd5 = "";
             var hash = MD5.Create().ComputeHash(Encoding.Default.GetBytes(maskedTextBox1.Text.ToCharArray()));
             foreach (byte h in hash)
             {
                 pwd5 += h.ToString("x2");
             }
             if (pwd5.Equals(userList[i].password))
             {
                 uu = userList[i];
                 found = true;
             }
         }
     }
     if (found)
     {
         this.DialogResult = DialogResult.OK;
     }
     else
     {
         toolStripStatusLabel1.Text = "Username or password is wrong";
     }
 }
        public Users()
        {
            InitializeComponent();

            string[] uspwd = Properties.Settings.Default.users.Split(';');
            uu = new Login();
            if (uu.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                user = uu.getUser();
                for (int i = 0; i < uspwd.Length; i++)
                {
                    if (uspwd[i].Length > 0)
                    {
                        UserDetails ud = new UserDetails();
                        string[] ss = uspwd[i].Split(':');
                        ud.username = ss[0];
                        ud.password = ss[1];
                        userList.Add(ud);
                        listView1.Items.Add(ud.username);
                    }
                }
            }
            else
            {
                Close();
            }
        }
 public Login()
 {
     InitializeComponent();
     string[] uspwd = Properties.Settings.Default.users.Split(';');
     for (int i = 0; i < uspwd.Length; i++)
     {
         if(uspwd[i].Length > 0)
         {
             UserDetails ud = new UserDetails();
             string[] ss = uspwd[i].Split(':');
             ud.username = ss[0];
             ud.password = ss[1];
             userList.Add(ud);
         }
     }
 }