Getting issue while downloading 4 t0 5 gb file from blob storage.

See more:

C#

C#4.0

Azure

Hi i have to download a file from blob storage upto 3 to 5 gb .

Below is my code:

Label lblfilename = (Label)row.FindControl("lblGrid_filename");
    Label lblfilesize = (Label)row.FindControl("lblGrid_hidfileSize");
    string downloadfile = lblfilename.Text.ToString();
   // DownloadFileFromBlob(downloadfile, CONTAINER, ACCOUNTKEY);
    AccountFileTransfer = CloudStorageAccount.Parse("DefaultEndpointsProtocol=https;AccountName=" + ACCOUNTNAME + ";AccountKey=" + ACCOUNTKEY);
    if (AccountFileTransfer != null)
    {
        BlobClientFileTransfer = AccountFileTransfer.CreateCloudBlobClient();
        ContainerFileTransfer = BlobClientFileTransfer.GetContainerReference(CONTAINER);
        ContainerFileTransfer.CreateIfNotExist();
        BlobRequestOptions options = new BlobRequestOptions();

        options.Timeout = new TimeSpan(0, 180, 0);
    }

    var data = Regex.Match(lblfilesize.Text.ToString(), @"\d+").Value;

    int value32;
    Int64 value64;
    var blobSize = 0L;
    var blockSize = 0L;
    var offset = 0L;
    if (int.TryParse(data, out value32))
    {

        blobSize = Convert.ToInt32(lblfilesize.Text.ToString());
    }
    else if (Int64.TryParse(data, out value64))
    {
        blobSize = Convert.ToInt64(lblfilesize.Text.ToString());

    }


    var blob = ContainerFileTransfer.GetBlockBlobReference(downloadfile);

    var sasUrl = blob.Uri.AbsoluteUri;


    CloudBlockBlob blockBlob = new CloudBlockBlob(sasUrl);

    //blobSize = Convert.ToInt32(lblfilesize.Text.ToString());
    blockSize = 5 * 1024 * 1024;
    Response.Clear();
    Response.ContentType = "APPLICATION/OCTET-STREAM";
    System.String disHeader = "Attachment; Filename=\"" + blockBlob.Name + "\"";
    //Response.AppendHeader("Content-Disposition", disHeader);

    for (offset = 0; offset < blobSize; offset += blockSize)
    {
        using (var blobStream = blockBlob.OpenRead())
        {
            if ((offset + blockSize) > blobSize)
            {
                blockSize = (blobSize - offset);
            }

            byte[] buffer = new byte[blockSize];
            blobStream.Read(buffer, 0, buffer.Length);
            Response.BinaryWrite(buffer);
            Response.Flush();
        }
    }
    Response.End();

error:
Unable to read data from the transport connection: The connection was closed.