I written this code to search the blob items (text files) on the basis of there content. For ex : if I search for "Good", then the files that contains "Good or good" word the name of that files should appear in search result. My code is working but i want to optimize it.

class BlobSearch
{
    public static int num = 1;
    static void Main(string[] args)
    {
        string accountName = "accountName";
        string accessKey = "accesskey";
        string azureConString = "DefaultEndpointsProtocol=https;AccountName=" + accountName + ";AccountKey=" + accessKey;
        string blob = "MyBlobContainer";
        string searchText = string.Empty;

        Console.WriteLine("Type and enter to search : ");
        searchText = Console.ReadLine();

        CloudStorageAccount account = CloudStorageAccount.Parse(azureConString);
        CloudBlobClient blobClient = account.CreateCloudBlobClient();
        CloudBlobContainer blobContainer = blobClient.GetContainerReference(blob);

        blobContainer.FetchAttributes();
        var blobItemList = blobContainer.ListBlobs();
        GetBlobList(searchText, blobContainer, blobItemList);

        Console.ReadLine();
    }

    private static async void GetBlobList(string searchText, CloudBlobContainer blobContainer, IEnumerable<IListBlobItem> blobItemList)
    {
        foreach (var item in blobItemList)
        {
            string line = string.Empty;
            CloudBlockBlob blockBlob = blobContainer.GetBlockBlobReference(item.Uri.ToString());
            if (blockBlob.Name.Contains(".txt"))
            {
                await Search(searchText, blockBlob);
            }
        }
    }


    private async static Task Search(string searchText, CloudBlockBlob blockBlob)
    {
        string text = await blockBlob.DownloadTextAsync();
        if (text.ToLower().IndexOf(searchText.ToLower()) != -1)
        {
            Console.WriteLine("Result : " + num + " => " + blockBlob.Name.Substring(blockBlob.Name.LastIndexOf('/') + 1));
            num++;
        }
    }
}

I think blobContainer.ListBlobs(); is blocking code because search will not work until all the blob items loaded. Is there anyway to optimize it or anywhere else in my code.

Thanks