you can do this using by this code:
using System.Reflection;
Assembly asm = Assembly.GetEntryAssembly();
string path = asm.GetName().ToString();
path = path.Substring(0, path.IndexOf(","));
string formname = path + "Your_Form_or_class_name_here";
Type formtype = asm.GetType(formname);
Form f = (Form)Activator.CreateInstance(formtype);
f.Show();