با سلام.
یا:
//in the name of god
//صل الله علی محمد و آله
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
{
public Form1()
{
InitializeComponent();
this.AcceptButton = button1;
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.ContainsFocus) textBox2.Text = textBox1.Text;
if (textBox2.ContainsFocus) textBox1.Text = textBox2.Text;
}
}
}