private void button3_Click(object sender, EventArgs e)
        {
            int Find_result;
            chloe_control_all chloe_obj = new chloe_control_all("Data Source=DESKTOP-O4C25KM;Initial Catalog=场馆预约系统;Integrated Security=True");

            Find_result = chloe_obj.user_find(textBox1.Text);
            if (Find_result == 0)
            {
                MessageBox.Show("该用户名可以使用!");
            }
            else if (Find_result == 1)
            {
                MessageBox.Show("该用户名已被注册,请重新输入");
            }
        }