Azure Event grid - Custom event handler

AzureEventGridEventHandler.cs

public async Task<IActionResult> Post([FromBody]object request)
{
    try
    {
        var eventGridEvent = JsonConvert.DeserializeObject<EventGridEvent[]>(request.ToString());
        
        foreach (var item in eventGridEvent)
        {
            
        if (string.Equals(item.EventType, "Microsoft.EventGrid.SubscriptionValidationEvent", StringComparison.OrdinalIgnoreCase))
                {   
                    var data = item.Data as JObject;
                    var eventData = data.ToObject<SubscriptionValidationEventData>();
                    var responseData = new SubscriptionValidationResponse
                    {
                        ValidationResponse = eventData.ValidationCode
             };
                                                
                    return Ok(responseData);
         }
            else
            {            
                await DoSomethingWithEvent(item.Data.ToString());
        }

        }
      }
      catch (Exception ex)
      {
          telemetry.TrackException(ex);
        throw;
       }

       return Ok();

}