Async method with three internal tasks

Question

Consider we have three different database stores which we want to find an Id which is unique in all this three. I mean if we query first data store and we find that id. It's over and there is no need to further attempt, if that Id is in non of this three data stores we return null, I'm new in asynchronous programming, I wanted to know if there is any better implementation for this lines of code? I mean less if/else?

 public async Task<WebData> GetDataByIdAsync(GetDataById input)
    {
        var twitterData = await DataAccess.FindDataById<TwitterData>(input.Id);
        WebData result;
        if (twitterData  == null)
        {
            var facebookData = await DataAccess.FindDataById<FacebookData>(input.Id);
            if facebookData == null)
            {
                var linkedinData = await DataAccess.FindDataById<LinkedinData>(input.Id);
                if linkedinData == null)
                {
                    return null;
                }
                result = linkedinData 
            }
            else
            {
                result = facebookData;
            }
        }
        else
        {
            result = twitterData ;
        }
        return result;
    }

Answer 1

Use the return pattern:

public async Task<WebData> GetDataByIdAsync(GetDataById input) 
{ 
    var twitterData = await DataAccess.FindDataById<TwitterData>(input.Id); 
    if (twitterData != null)
    {
        return twitterData;
    } 

    var facebookData = await DataAccess.FindDataById<FacebookData>(input.Id); 
    if (facebookData != null) 
    {
        return facebookData;
    } 

    var linkedinData = await DataAccess.FindDataById<LinkedinData>(input.Id); 
    if (linkedinData != null) 
    { 
        return linkedinData; 
    }

    return null;
}

Answer 2

Short and clean using null-coalescing operator:

public async Task<WebData> GetDataByIdAsync(GetDataById input) 
{ 
    return await DataAccess.FindDataById<TwitterData>(input.Id)?? 
           await DataAccess.FindDataById<FacebookData>(input.Id)??
           await DataAccess.FindDataById<LinkedinData>(input.Id); 
}

Answer 3

An efficient way of doing this (if you don't care about the overhead on the data stores) would be to start all three tasks, then return when the first of the tasks produces a non-null value. Something like this:

public async Task<WebData> GetDataByIdAsync(GetDataById input) 
{
    var remainingTasks = new HashSet<Task<WebData>>(new [] { DataAccess.FindDataById<TwitterData>(input.Id), DataAccess.FindDataById<FacebookData>(input.Id), DataAccess.FindDataById<LinkedinData>(input.Id) });

    while (remainingTasks.Any())
    {
        var firstCompleted = await Task.WhenAny(remainingTasks);
        if (firstCompleted.Result != null)
        {
             return firstCompleted.Result;
        }
        remainingTasks.Remove(firstCompleted);
    }

    return null;
}