LabExer5_Register.cs

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

namespace MyForm
{
    public class Register : Form
    {
        private Button btCancel;
        private Button btContinue;
        private TextBox username;
        private TextBox password;
        private Label uname;
        private Label passw;
        private Label accntype;
        private CheckBox chPass;
        private ComboBox cbType;

        public Register()
        {
            InitializeComponents();
        }

        public void InitializeComponents()
        {
            this.Text = "Register";
            this.BackColor = Color.Lavender;
            this.ForeColor = Color.Black;
            this.Size = new Size(250, 300);
            this.StartPosition = FormStartPosition.CenterScreen;

            btContinue = new Button();
            btContinue.Location = new Point(40, 220);
            btContinue.Text = "Continue";
            btContinue.Click += btContinue_Click;

            btCancel = new Button();
            btCancel.Location = new Point(120, 220);
            btCancel.Text = "Cancel";
            btCancel.Click += btCancel_Click;

            username = new TextBox();
            username.Text = "";
            username.MaxLength = 10;
            username.Location = new Point(80, 30);

            password = new TextBox();
            password.Text = "";
            password.UseSystemPasswordChar = true;
            password.Location = new Point(80, 60);

            uname = new Label();
            uname.Text = "Username";
            uname.Location = new Point(20, 30);

            passw = new Label();
            passw.Text = "Password";
            passw.Location = new Point(20, 60);

            accntype = new Label();
            accntype.Text = "Account";
            accntype.Location = new Point(20, 110);

            chPass = new CheckBox();
            chPass.Location = new Point(80, 78);
            chPass.TabIndex = 8;
            chPass.Text = "Show Password";
            chPass.UseVisualStyleBackColor = true;
            chPass.CheckedChanged += new System.EventHandler(chPass_CheckedChanged);

            cbType = new ComboBox();
            cbType.Location = new Point(80, 110);
            cbType.Items.AddRange(new object[] { "Type One", "Type Two" });


            this.Controls.Add(username);
            this.Controls.Add(password);
            this.Controls.Add(uname);
            this.Controls.Add(passw);
            this.Controls.Add(chPass);
            this.Controls.Add(cbType);
            this.Controls.Add(accntype);
            this.Controls.Add(btContinue);
            this.Controls.Add(btCancel);
        }

        public void btContinue_Click(object sender, EventArgs e)
        {
            string path = String.Concat("", username.Text, ".txt");
            if (File.Exists(path))
            {
                MessageBox.Show("Username is already taken.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            else if (username.Text == "" || password.Text == "" || cbType.Text == "")
            {
                MessageBox.Show("Please fill in empty blanks.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            using (StreamWriter sw = new StreamWriter(path))
            {
                sw.WriteLine(password.Text);
                sw.WriteLine(cbType.Text);
            }
            this.Hide();
            Login log = new Login();
            log.Show();
        }

        public void btCancel_Click(object sender, EventArgs e)
        {
            Index ind = new Index();
            ind.Show();
            this.Hide();
        }

        private void chPass_CheckedChanged(object sender, EventArgs e)
        {
            if (chPass.CheckState == CheckState.Checked)
                password.UseSystemPasswordChar = false;
            else
                password.UseSystemPasswordChar = true;
        }
    }
}