Define Block Blob size in GB

Question

Hi all,
I have used the following code to define the block blob size in MB and then download this file. Its working fine.
protected void btn_download_Click1(object sender, EventArgs e)
    Button btndownloadrow = (Button)sender;
    GridViewRow row = (GridViewRow)btndownloadrow.NamingContainer;
    Label lblfilename = (Label)row.FindControl("lblGrid_filename");
    string downloadfile = lblfilename.Text.ToString();
    AccountFileTransfer = CloudStorageAccount.Parse("DefaultEndpointsProtocol=http;AccountName=" + ACCOUNTNAME + ";AccountKey=" + ACCOUNTKEY);
    if (AccountFileTransfer != null)
        BlobClientFileTransfer = AccountFileTransfer.CreateCloudBlobClient();
        ContainerFileTransfer = BlobClientFileTransfer.GetContainerReference(CONTAINER);
        ContainerFileTransfer.CreateIfNotExist();
    var blob = ContainerFileTransfer.GetBlockBlobReference(downloadfile);
    var sasUrl = blob.Uri.AbsoluteUri;
    CloudBlockBlob blockBlob = new CloudBlockBlob(sasUrl);
   var blobSize = 551* 1024 * 1024; // Block blob size of 551 MB
   int blockSize = 1024 * 1024 * 1; //  chunk of size 1 MB
    Response.Clear();
    Response.ContentType = "APPLICATION/OCTET-STREAM";
    System.String disHeader = "Attachment; Filename=\"" + blockBlob.Name + "\"";
    Response.AppendHeader("Content-Disposition", disHeader);
    for (long offset = 0; offset < blobSize; offset += blockSize)
        using (var blobStream = blockBlob.OpenRead())
            if ((offset + blockSize) > blobSize)
                blockSize = (int)(blobSize - offset);
            byte[] buffer = new byte[blockSize];
            blobStream.Read(buffer, 0, buffer.Length);
            Response.BinaryWrite(buffer);
            Response.Flush();
    Response.End();
The problem which I am facing is that when I tried to define the block blob size in GB I am getting overflow error. I am trying to download a file of size around 3 gb. I am using this:-
  var blobSize = 3558 * 1024 * 1024; // trying to define the block blob size of around 3 GB here I am getting overflow error
Could you please help me so that I can define the block blob size in GBs so that I can download the file from azure using block blob storage.
Thanks.

Answer 1

Hi,
Thanks for sharing the solution about how to avoid overflow error, it will be very beneficial for other community members who have similar questions. If you have any difficulty in future programming, we welcome you to post in forums again.
Best Regards,
Jambor
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