handling button click event in a fragment in xamarin - android-fragments

Question

so i'm creating an android app using Xamarin.android and i'm using the navigation drawer app. I added a fragment and within the fragment I added a button. now I need to handle some events of this button. I tried adding a click event function in the fragment.cs code but I got an exception "System.NullReferenceException: 'Object reference not set to an instance of an object.'". how am I supposed to handle the event?
this is the code of my main activity where I access my fragment when choosing the camera icon option:
Fragment1 fragment = new Fragment1();
public bool OnNavigationItemSelected(IMenuItem item)
{
int id = item.ItemId;
if (id == Resource.Id.nav_camera)
{
SupportFragmentManager.BeginTransaction()
.Replace(Resource.Id.mainFrame, fragment )
.Commit();
}
and this is my fragment's xml code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="hi"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minWidth="25px"
android:minHeight="25px"
android:id="#+id/textView1" />
<Button
android:text="Button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/button1" />
</LinearLayout>
and this is my fragment's c# code where I try to access the button:
public class Fragment1 : Android.Support.V4.App.Fragment
{
public override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Create your fragment here
}
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
// Use this to return your custom view for this Fragment
base.OnCreate(savedInstanceState);
var view = inflater.Inflate(Resource.Layout.fragment1, container, false);
Button bulogin = View.FindViewById<Button>(Resource.Id.button1);
bulogin.Click += Bulogin_Click;
// return base.OnCreateView(inflater, container, savedInstanceState);
return view;
}
private void Bulogin_Click(object sender, EventArgs e)
{
TextView txt = View.FindViewById<TextView>(Resource.Id.textView1);
txt.Text = "bye";
}
}