调试易

不要就给别人        private void button1_TabIndexChanged(object sender, EventArgs e)
        {
            if (button1.Focused == true)
                textBox1.Focus();
        }        
        private void button1_MouseClick(object sender, MouseEventArgs e)
        {
            if (button1.Focused == true)
                textBox1.Focus();
        }

+1
http://msdn.microsoft.com/zh-cn/vstudio/system.windows.forms.control.tabstop.aspx
TapStop详细介绍