Praktika/Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Rakhmanow1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Button button = new Button();
            button.Text = "Click";
            button.Location = new Point(50, 50);
            button.Size = new Size { Width = 80, Height = 30 };
            button.Click += (o, e) => MessageBox.Show("Здравствуйте");
            this.Controls.Add(button);
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}