namespace _1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            textBox1.Visible = true;

            textBox1.Text = "努力学习C#!";

            textBox1.BackColor = Color.Blue;//背景颜色为蓝色

            textBox1.Location = new Point(, );//位置

        }

        private void button2_Click(object sender, EventArgs e)

        {

            textBox1.Text = "";

            textBox1.Visible = false;//隐藏

            textBox1.BackColor = Color.White;

        }

    }

}