android - Execution order of OnActivityResult and OnResume -

i understand onactivityresult should called before onresume in activity that's not happening me. i'm finding gets called before onresume, , before onstart. sample code below, i'm breakpointing relevant methods see what's happening. what's going on?

activity 1

using system; using system.collections.generic;  using android.app; using android.content; using android.runtime; using android.views; using android.widget; using android.os; using android.content.pm;  namespace lifecycletest {     [activity(mainlauncher = true)]     public class activity1 : activity     {         protected override void oncreate(bundle bundle)         {             base.oncreate(bundle);              this.setcontentview(resource.layout.main);              this.findviewbyid<button>(resource.id.button1).text = "start activity 2";             this.findviewbyid<button>(resource.id.button1).click += button_click;         }          void button_click(object sender, eventargs e)         {             intent = new intent(this, typeof(activity2));             this.startactivityforresult(i, 1);         }          protected override void onstop()         {             base.onstop();         }          protected override void onresume()         {             base.onresume();         }          protected override void onstart()         {             base.onstart();         }          protected override void onactivityresult(int requestcode, result resultcode, intent data)         {             base.onactivityresult(requestcode, resultcode, data);         }     } } 

activity 2

using system; using system.collections.generic;  using android.app; using android.content; using android.runtime; using android.views; using android.widget; using android.os; using android.content.pm;  namespace lifecycletest {     [activity]     public class activity2 : activity     {         protected override void oncreate(bundle bundle)         {             base.oncreate(bundle);              this.setcontentview(resource.layout.main);              this.findviewbyid<button>(resource.id.button1).text = "return result";             this.findviewbyid<button>(resource.id.button1).click += button_click;         }           void button_click(object sender, eventargs e)         {             this.setresult(result.ok);             this.finish();         }     } } 

layout

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:minwidth="25px"     android:minheight="25px">     <button         android:text="button"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:id="@+id/button1" /> </linearlayout> 

this happens when activity set "singleinstance". activity singleinstance. try removing it.