Mohan_reg(GUI) registration in gui

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

namespace POIA
{
    public partial class Registration : Form
    {
        public Registration()
        {
            InitializeComponent();
        }

        private void Registration_Load(object sender, EventArgs e)
        {

        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }

        private void label10_Click(object sender, EventArgs e)
        {

        }

        private void pictureBox2_Click(object sender, EventArgs e)
        {
            
        }

        private void textBox6_TextChanged(object sender, EventArgs e)
        {
            if (textBox6.Text == "")
            {
                MessageBox.Show("Enter the user id");
                textBox6.Clear();
                textBox6.Focus();
            }
            if (!Regex.IsMatch(textBox6.Text, "[0-9]+$"))
            {
                MessageBox.Show("Enter integers only");
                textBox6.Clear();
                textBox6.Focus();
            }
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "" || textBox5.Text == "" || textBox6.Text == "" || textBox7.Text == "" || textBox8.Text == "" || richTextBox1.Text == "" )
            {
                MessageBox.Show("Enter the Details..!! ");
            }
            else
            {
                try
                {
                    POIA.BLL.RegistrationFormBLL ro = new POIA.BLL.RegistrationFormBLL();
                    ro.firstname = textBox1.Text;
                    ro.lastname = textBox2.Text;
                    ro.gender = comboBox3.Text;
                    ro.dateofbirth =(dateTimePicker1.Value);
                    ro.address = richTextBox1.Text;
                    ro.phonenumber = textBox3.Text;
                    ro.annualincome = textBox4.Text;
                    ro.emailid = textBox5.Text;
                    ro.policyname = comboBox1.Text;
                    ro.userId = textBox6.Text;
                    ro.password = textBox7.Text;
                    ro.securityquestion = comboBox2.Text;
                    ro.securityanswer = textBox8.Text;
                    ro.RegistrationM();
                    MessageBox.Show("Registration Successful..!!"); 
                }
                catch (Exception e1)
                {
                    MessageBox.Show(e1.Message, "Error..!!");
                }
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (!Regex.IsMatch(textBox1.Text, "[a-z A-Z]+$"))
            {
                MessageBox.Show("Enter alphabets only");
                textBox1.Clear();
                textBox1.Focus();
            }
        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
            if (!Regex.IsMatch(textBox2.Text, "[a-z A-Z]+$"))
            {
                MessageBox.Show("Enter alphabets only");
                textBox2.Clear();
                textBox2.Focus();
            }
        }

        private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (comboBox3.Text == "")
            {
                MessageBox.Show("Select any one option");
            }

        }

        private void richTextBox1_TextChanged(object sender, EventArgs e)
        {
            if (richTextBox1.Text == "")
            {
                MessageBox.Show("Enter address");
                richTextBox1.Clear();
                richTextBox1.Focus();
            }
        }

        private void textBox3_TextChanged(object sender, EventArgs e)
        {
            if (!Regex.IsMatch(textBox3.Text, "[0-9]+$"))
            {
                MessageBox.Show("Enter integers only");
                textBox3.Clear();
                textBox3.Focus();
            }
            else if (textBox3.Text.Length > 10)
            {
                MessageBox.Show("Enter 10 numbers only");
                textBox3.Clear();
                textBox3.Focus();
            }

        }

        private void textBox4_TextChanged(object sender, EventArgs e)
        {
            if (!Regex.IsMatch(textBox4.Text, "[0-9]+$"))
            {
                MessageBox.Show("Enter integers only");
                textBox4.Clear();
                textBox4.Focus();
            }
        }

        private void textBox5_TextChanged(object sender, EventArgs e)
        {
            if (!Regex.IsMatch(textBox5.Text, "[0-9 a-z _ @]+$"))
            {
                MessageBox.Show("Only 0-9,uppercase letters, lowercase letters, _ and @ are allowed");
                textBox5.Clear();
                textBox5.Focus();
            }
        }

        private void textBox7_TextChanged(object sender, EventArgs e)
        {
           if (textBox7.Text.Length > 8)
            {
                MessageBox.Show("Password should be exactly 8 characters");
                textBox7.Clear();
                textBox7.Focus();
            }
        }

        private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void textBox8_TextChanged(object sender, EventArgs e)
        {
            if (!Regex.IsMatch(textBox8.Text, "[a-z A-Z]+$"))
            {
                MessageBox.Show("Enter Alphabets Only");
                textBox8.Clear();
                textBox8.Focus();
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Clear();
            textBox2.Clear();
            textBox3.Clear();
            textBox4.Clear();
            textBox5.Clear();
            textBox6.Clear();
            textBox7.Clear();
            textBox8.Clear();
            richTextBox1.Clear();
        }

       
    }
}