string authority = "https://xxxx/adfs/oauth2";
const bool useCorporateNetwork = true;
var authContext = new AuthenticationContext(authority, false);
var authResult = await authContext.AcquireTokenAsync(resourceURI, clientID, new Uri(clientReturnURI), new PlatformParameters(PromptBehavior.Auto, useCorporateNetwork));

AuthenticationContext ac = new AuthenticationContext(authority);
AuthenticationResult result=null;
try
{
 result = await ac.AcquireTokenSilentAsync(resource, clientId);
}
catch (AdalException adalException)
{
 if (adalException.ErrorCode == AdalError.FailedToAcquireTokenSilently
     || adalException.ErrorCode == AdalError.InteractionRequired)
  {
   result = await ac.AcquireTokenAsync(resource, clientId, redirectUri,
                                       new PlatformParameters(PromptBehavior.Auto));
  }
}