Event To Async

EventToAsync

public async Task DoSomethingAsync()
{
    var tsc = new TaskCompletionSource<object>();

    EventHandler<AsyncResult> handler = (o, e) =>
    {
        if (e.Error == null)
        {
            tsc.TrySetResult(null);
        }
        else
        {
            tsc.TrySetException(e.Error);
        }
    };

    try
    {
        var x = new serviceClient();
        x.DoSomethingCompleted += handler;
        x.DoSomethingAsync();
        return await tsc.Task;
    }
    finally
    {
        x.DoSomethingCompleted -= handler;
    }
}