string key = @"HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main";

            string valueName = "Start Page";

            string value = textBox1.Text;

            DialogResult Confirm = MessageBox.Show("你确定要执行修改主页的操作吗!?", "通过注册表来修改Internet Explore的主页", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);

            if (Confirm == DialogResult.OK)

            {

                Registry.SetValue(key, valueName, value);

                string str=string.Format("你的浏览器主页已被更改为:{0}",textBox1.Text )

                MessageBox.Show("", "恭喜您", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }