Create a file in a folder of an Azure-hosted websi

I need to copy a file from Azure Blob Storage to the "contents" folder of my Azure hosted website, and I am struggling to make this work ! Any help would be very much appreciated. The code works fine on my local server, but fails when hosted on Azure.

Here is my function:

public bool CopyFromAzure(string myContainer, string fileName, string filePath)
    {
        // Retrieve storage account from connection string.
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
           ConfigurationManager.ConnectionStrings["StorageConnectionString"].ConnectionString);

        // Create the blob client.
        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

        // Retrieve reference to a previously created container.
        CloudBlobContainer container = blobClient.GetContainerReference(myContainer);

        // Retrieve reference to a blob named "myblob".
        CloudBlockBlob blockBlob = container.GetBlockBlobReference(fileName);

        try
        {
            // Save blob contents to a file. 
            // --> here is where an error happens !! on System.IO.File.Create
            // The value of "filePath" is: F:\sitesroot\0\Content\tmp\file_2cfe0a3d-fa7a-4ab4-a665-cdebd90567d4.pdf

            using(FileStream fs= System.IO.File.Create(@filePath))
            {
                blockBlob.DownloadToStream(fs);
            }
        }
        catch (Exception e)
        {
            return false;
        }

        return true;
    }

Question: can this be linked to Security preferences in Azure or in my website configuration?

Thxs

Problem finally solved. For some reason, write rights were not allowed on subfolders of the Azure distribution (ie: /Content/tmp). I solved the pb by simply writing my files to the root of the project.

The code that worked:

            string filePath = HttpContext.Current.Server.MapPath("~/" + fileName);
            using (FileStream fs = System.IO.File.OpenWrite(filePath))
            {
                blockBlob.DownloadToStream(fs);
            }