delegate DialogResult Dlg1(string aa);
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

      
        private void Form1_Load(object sender, EventArgs e)
        {
            string aa = "Hello  Word";
            Dlg1 a = new Dlg1(MessageBox.Show);
            a(aa);
        }
    }