code:

 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnClass_Click(object sender, EventArgs e)
        {
            ClassMan c = new ClassMan();
            c.Name = txtC.Text;
            txtCResult.Text = c.SayName();
        }

        private void btnStruct_Click(object sender, EventArgs e)
        {
            StructMan s = new StructMan();
            s.Name = txtS.Text;
            txtSResult.Text = s.SayName();
        }
    }

    public class ClassMan
    {
        string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public string SayName()
        {
            return String.Format("I am {0}.", Name);

        }

    }

    public struct StructMan
    {
        string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public string SayName()
        {
            return String.Format("I am {0}.", Name);

        }
    }