Upload to azureBlob fails

Hi,

I'm exporting an entity then sending the file to azure blob.

However when the file gets bigger, i noticed that uploading is failing. (exporting the entity was a succes)

i received files with 1.8GB,1.9GB and when i increased the records it started failing.

Here's my code

system.exception ex;
try
{
Microsoft.WindowsAzure.Storage.Auth.StorageCredentials  storageCredentials  = new Microsoft.WindowsAzure.Storage.Auth.StorageCredentials(StorageAccountName, StorageKey);
Microsoft.WindowsAzure.Storage.CloudStorageAccount      storageAccount      = new Microsoft.WindowsAzure.Storage.CloudStorageAccount(storageCredentials, true);
var                                                     blobcli             = storageAccount.CreateCloudBlobClient();
Microsoft.WindowsAzure.Storage.Blob.CloudBlobContainer  cont                = blobcli.GetContainerReference(BlobContainer);

stream.Position=0;

Microsoft.WindowsAzure.Storage.Blob.CloudBlockBlob      cloudBlockBlob      = cont.GetBlockBlobReference(fileName);
cloudBlockBlob.UploadFromStream(stream,null,null,null);
}
catch(ex)
{ 
 throw error(ex.message);
}

My question is:

1. Why is it failing? is there a restriction on sizes bigger than 2GB? and how to solve this?
2. why I'm not catching the error that is happening?