private void button1_Click(object sender, EventArgs e)
        {
            //判断文本框是否有值
            if (textBox2.Text == "")
            {
                MessageBox.Show("文本框无值，不能显示panel控件");
                //文本框无值，把焦点放到文本框上
                textBox2.Focus();
            }
            else
            {
                if (textBox2.Text == "显示panel")
                {
                    panel1.Visible = true;//显示panel,panel中包含另一个文本框textbox1
                }
                else
                {
                    MessageBox.Show("文本框有值，但却不能显示panel控件");
                }
            }

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //窗体初始化加载禁用panel面板容器控件
            panel1.Visible = false;
            //设置面板控件panel的边框
            panel1.BorderStyle. = BorderStyle.Fixed3D;//边框样式
            textBox1.Text = "姓名";
        }