using System;

using System.Windows.Forms;

​

namespace HelloWin

{

    public class MyForm : Form

    {

    private TextBox txtEnter;

    private Label lblDisplay;

    private Button btnOK;

    public Form()

    {

        this.txtEnter = new TextBox();

        this.lblDisplay = new Label();

        this.btnOK = new Button();

        this.Text = "My HelloWin Application";

        //txtEnter

        this.txtEnter.Location = new System.Drawing.Point(16, 32);

        this.txtEnter.Size = new System.Drawing.Size(264, 20);

        //lblDisplay

        this.lblDisplay.Location = new System.Drawing.Point(16, 72);

        this.lblDisplay.Size = new System.Drawing.Size(264, 128);

        //btnOK

        this.btnOK.Location = new System.Drawing.Point(88, 224);

        this.btnOK.Text = "OK";

        this.btnOK.Click += new System.EventHandler(this.btnOK_Click);

        //MyForm

        this.Controls.AddRange(new Control[] {this.txtEnter, this.lblDisplay, this.btnOK});

    }

    static void Main ()

    {

        Application.Run(new MyForm());

    }

    private void btnOK_Click(object sender, System.EventArgs e)

    {

        lblDisplay.Text = txtEnter.Text + "\n" + lblDisplay.Text;

    }

    }

}