System.Reflection.Assembly assembly = System.Reflection.Assembly.GetEntryAssembly(); //DLL'i çağıran ana uygulama
if (assembly == null)
assembly = System.Reflection.Assembly.GetExecutingAssembly(); //Kodu çalıştıran uygulama
string version = System.Diagnostics.FileVersionInfo.GetVersionInfo(assembly.Location).FileVersion; //versiyon