NameSpacedeki tüm class isimlerini öğrenme ve NameSpaceden Form Açmakaynak ->  

https://stackoverflow.com/questions/949246/how-can-i-get-all-classes-within-a-namespace

1-) C# RMOS - Metot

 private Type[] GetTypesInNamespace(Assembly assembly, string nameSpace)

        {

            return

              assembly.GetTypes()

                      .Where(t => String.Equals(t.Namespace, nameSpace, StringComparison.Ordinal))

                      .ToArray();

        }

2-) Kullanımı

Type[] typelist = GetTypesInNamespace(Assembly.GetExecutingAssembly(), "OrderTakerUltimate.Source");

                for (int i = 0; i < typelist.Length; i++)

                {

                    Console.WriteLine(typelist[i].Name);

                }

3-) eğer .Net 2.0 kullanıyorsan

  Assembly myAssembly = typeof(< Namespace >.< someClass >).GetTypeInfo().Assembly;

                Type[] typelist = GetTypesInNamespace(myAssembly, "<Namespace>");

                for (int i = 0; i < typelist.Length; i++)

                {

                    Console.WriteLine(typelist[i].Name);

                }

4-) NameSpace'den Form Açma

var form = Activator.CreateInstance(Type.GetType("OrderTakerUltimate.Source." + Form_adi)) as Form;

                         form.ShowDialog();

5-) ikinci maddenin "2-)" özelleşmiş hali yani Formu açmak için böyle yapabilirsin . Varsa açar

 string Form_adi = gridView1.GetRowCellValue(gridView1.FocusedRowHandle, gridView1.Columns["rForm_ad"]).ToString();

                Type[] typelist = GetTypesInNamespace(Assembly.GetExecutingAssembly(), MyNameSpace);

                for (int i = 0; i < typelist.Length; i++)

                {

                    var form = Activator.CreateInstance(Type.GetType(MyNameSpace + "." + typelist[i].Name)) as Form;

                    Console.WriteLine(typelist[i].Name+"-"+ form.Text);

                    if (typelist[i].Name.Equals(Form_adi))

                    {

                        form.ShowDialog();

                        break;

                    }

                }