MessageForm (Form)

using System;
using System.Windows.Forms;

internal partial class MessageForm : Form
{
    internal MessageForm()
    {
        InitializeComponent();
    }

    private void btnYes_Click(object sender, EventArgs e)
    {
        this.DialogResult = DialogResult.Yes;
    }

    private void btnNo_Click(object sender, EventArgs e)
    {
        this.DialogResult = DialogResult.No;
    }

    private void btnCancel_Click(object sender, EventArgs e)
    {
        this.DialogResult = DialogResult.Cancel;
    }

    private void btnOK_Click(object sender, EventArgs e)
    {
        this.DialogResult = DialogResult.OK;
    }
}