Active Control

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 dotFocus

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

          

        }

        private void button1_Click(object sender, EventArgs e)

        {

            ActiveControl = textBox1;

        }

        private void button2_Click(object sender, EventArgs e)

        {

            ActiveControl = textBox2;

        }

        private void button3_Click(object sender, EventArgs e)

        {

            ActiveControl = textBox3;

        }

    }

}