how to get rid of the warning "captured variable is disposed in the outer scope"

For below code I am getting warning for client saying captured variable is disposed in the outer scope, what’s is meaning for this and how can I get rid of it?

using (var client = DeviceClient.CreateFromConnectionString(""))
            {
                //Loop through each batch in the chunked list
                var concurrentTasks = list.Select(r=>
                    Task.Run(async () =>
                    {
                        await Push(r, client);

                    })).ToList();
                //complete all the tasks.
                await Task.WhenAll(concurrentTasks);
            }


 private async Task Push(List<R> r, DeviceClient client)
    {
      await client.SendEventAsync(new Message(e));
}

>Solution :

I think the inner code is wrong anyhow. You’re not in a synchronous scope, so just write

await Task.WhenAll(
    list.Select(r => Push(r, client)).ToList());

No need for all the separate Task.Runs because they just wrap a Task in Task