c# create list from list of async tasks code example

Example: listaddtoleftasync example c#

public async Task<long> ListAddToLeftAsync<T>(string key, T item) where T : class
        {
            if (string.IsNullOrEmpty(key))
            {
                throw new ArgumentException("key cannot be empty.", nameof(key));
            }
 
            if (item == null)
            {
                throw new ArgumentNullException(nameof(item), "item cannot be null.");
            }
 
            var serializedItem = await Serializer.SerializeAsync(item);
 
            return await Database.ListLeftPushAsync(key, serializedItem);
        }