How To Add Multiple Textbox And Button At A Time In Window Form Application

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;
namespace WindowsFormsApplication1 {
    public partial class Form1: Form {
        int ctextbox;
        int cbutton;
        int btntop = 1;
        public Form1() {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e) {
            try {
                ctextbox = int.Parse(textBox1.Text);
                cbutton = int.Parse(textBox2.Text);
                if (textBox1.Text == "" && textBox2.Text == "") {
                    MessageBox.Show("Please enter your value first");
                } else {
                    for (int i = 0; i <= int.Parse((textBox1.Text)) - 1; i = i + 1) {
                        TextBox txt = new TextBox();
                        this.Controls.Add(txt);
                        txt.Text = "TextBox" + (i + 1);
                        txt.Top = btntop * 25;
                        txt.Left = 20;
                        txt.BackColor = Color.Red;
                        btntop = btntop + 1;
                    }
                    for (int i = 0; i <= int.Parse((textBox2.Text)) - 1; i = i + 1) {
                        Button btn = new Button();
                        this.Controls.Add(btn);
                        btn.Text = "Button" + (i + 1);
                        btn.Top = btntop * 25;
                        btn.Left = 20;
                        btn.BackColor = Color.Purple;
                        btntop = btntop + 1;
                    }
                }
            } catch {
                MessageBox.Show("Please enter valid number");
            }
        }
    }
}