blobs.cs

public class BlobCloudService
{
    readonly CloudBlobContainer _container;

    public BlobCloudService()
    {
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse("your connection string");
        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
        _container = blobClient.GetContainerReference("your container name");
    }

    public bool DoesBlobExist(string blobName)
    {
        var blob = _container.GetBlockBlobReference(blobName);
        return blob.Exists();
    }

    public CloudBlockBlob UploadBlob(string blobName, Stream inputStream)
    {
        CloudBlockBlob blobref = _container.GetBlockBlobReference(blobName);
        blobref.UploadFromStream(inputStream);
        return blobref;
    }

    public void DeleteBlob(string blobName)
    {
        var blob = _container.GetBlockBlobReference(blobName);
        blob.Delete();
    }
}