1 namespace exchangeTest 2 { 3     public partial class exchange : Form 4     { 5         public exchange() 6         { 7             InitializeComponent(); 8         } 9         //往文本框二添加文本框一的内容10         private void btnExchange_Click(object sender, EventArgs e)11         {12             text2.Text = text2.Text + text1.Text;13             btnExchange.Enabled = false;14             btnExchange0.Enabled = true;15             btnExchange.Focus();16         }17         //往文本框一添加文本框二的内容18         private void btnExchange0_Click(object sender, EventArgs e)19         {20             text1.Text = text1.Text + text2.Text;21             btnExchange0.Enabled = false;22             btnExchange.Enabled = true;23             btnExchange.Focus();24         }25         //窗体装载，初始化控件，文本框获得输入焦点26         private void Form1_Load(object sender, EventArgs e)27         {28             text1.Text = null;29             text2.Text = null;30             text1.Focus();31         }32     }33 }