title: RequestPermissions not showing dialog box xamarin c#
body: <p>I'm new to xamarin. I found lot of similar topics and i tried them. but non of them work for xamarin.</p>
  
  <p>I added the permission in the AndroidManifest for OS below Android M</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /&gt;
  </code></pre>
  
  <p>and I used <a href="https://docs.microsoft.com/en-us/xamarin/android/app-fundamentals/permissions?tabs=vswin" rel="noreferrer">This document</a> and implemented the code below.</p>
  
  <pre><code>string[] permissions ={Manifest.Permission.ReadExternalStorage};
  ActivityCompat.RequestPermissions(Activity, permissions, STORAGE_REQUEST_CODE);
  </code></pre>
  
  <p>ActivityCompat.RequestPermissions doesn't show the dialog box.</p>