Problem when taking a photo with the camera - xamarin.android

Question

I have a problem when dragging an image from the camera and making it wallpaper to ImageView.
I used the following code and it works on versions less than 5 .
But versions 5 or higher code does not work permanently and the camera does not work at all
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.camera_capimage" android:grantUriPermissions="true" android:installLocation="auto">
<uses-sdk android:minSdkVersion="17" android:targetSdkVersion="28" />
<application android:allowBackup="true" android:icon="#mipmap/ic_launcher" android:label="#string/app_name" android:roundIcon="#mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="#style/AppTheme"></application>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera" />
</manifest>
MainActivity
public class MainActivity : AppCompatActivity
{
public static Bitmap bitmap;
public static string fileName;
public ImageView _imageView;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
Button button = FindViewById<Button>(Resource.Id.button1);
_imageView = FindViewById<ImageView>(Resource.Id.imageView1);
button.Click += BtnCamera_Click;
}
protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Bitmap bitmap = (Bitmap)data.Extras.Get("data");
_imageView.SetImageBitmap(bitmap);
}
private void BtnCamera_Click(object sender, System.EventArgs e)
{
Intent intent = new Intent(MediaStore.ActionImageCapture);
StartActivityForResult(intent, 0);
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
error message
Java.Lang.SecurityException: 'Permission Denial: starting Intent { act=android.media.action.IMAGE_CAPTURE cmp=com.android.camera/.Camera } from ProcessRecord{273b163 23970:com.companyname.camera_capimage/u0a98} (pid=23970, uid=10098) with revoked permission android.permission.CAMERA'