public static string GetSignatureBlobName(string containerName, string blobName)
{
var client = AzureHelper.GetCloudBlobClient();
var container = client.GetContainerReference(containerName);
var blob = container.GetBlockBlobReference(blobName);
blob.FetchAttributes();
var sig = "";
if (blob.Metadata.ContainsKey(SIGURL))
{
sig = blob.Metadata[SIGURL];
}
return sig;
}