basic selection set

gistfile1.cs

[CommandMethod("basicSelSet")]
public void basicSelSet()
{
  Document acadDoc = Application.DocumentManager.MdiActiveDocument;
  Editor editor = acadDoc.Editor;
  PromptSelectionOptions promptSelOpt = new PromptSelectionOptions();
  promptSelOpt.MessageForAdding = "Select any objects: ";
  PromptSelectionResult result = editor.GetSelection(promptSelOpt);
  if (result.Status == PromptStatus.OK)
  {
    int index = 1;
    using (Transaction trans = acadDoc.Database.TransactionManager.StartOpenCloseTransaction())
    {
      foreach (SelectedObject selObj in result.Value)
      {
        Entity ent = trans.GetObject(selObj.ObjectId, OpenMode.ForRead) as Entity;
        editor.WriteMessage("\nObect " + index.ToString() + " in selection set is type: " + ent.GetRXClass().DxfName);
        index++;
      }
      trans.Commit();
    } 
  }
}