How to convert IAsync to Task Await Async

var result = await Task<OssObject>.Factory.FromAsync(client.BeginGetObject, client.EndGetObject, bucketName, key, null);

OssObject is the return object in method click.BeginGetObject

client.EndGetObject is the method which gets called once the BeginGetObject has completed.

bucketName happens to be an argument passed into BeginGetObject.