C#

Assembly assembly = Assembly.GetEntryAssembly();
Type[] types = assembly.GetTypes();
FormsCollection forms = new FormsCollection(); // It's a class to hold array of Forms
foreach(Type t in types)
{
                if (t.BaseType == typeof(Form))
                {                    
                    Form frm = (Form)Activator.CreateInstance(t);
                    frm.Name = t.Name;
                    forms.Add(frm);
                }
}
this.listBox1.DataSource = forms;
this.listBox1.DisplayMember = "Name"; // This property does not display anyThing

public class FormsCollection : CollectionBase
{
        public Form Add(Form frm)
        {
            base.List.Add(frm);
            return (frm);
        }

        public void Remove(Form frm)
        {
            base.List.Remove(frm);
        }

        public Form this[int index]
        {
            get
            {
                return (Form)base.List[index];
            }
            set
            {
                base.List[index] = value;
            }
        }
}