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    <p>I can't reproduce what you're seeing. Things seem to work as expected:</p> <pre><code>static void Main(string[] args) { // I also tried a real cloud storage account. Same result. var container = CloudStorageAccount.DevelopmentStorageAccount.CreateCloudBlobClient().GetContainerReference("testcontainer"); container.CreateIfNotExist(); var blob = container.GetBlobReference("testblob.txt"); blob.UploadText(new String('x', 5000000)); var source = blob.OpenRead(); int BUFFER_SIZE = 4000000; byte[] buffer = new byte[BUFFER_SIZE]; int bytesRead; int bytesCopied = 0; do { bytesRead = source.Read(buffer, 0, BUFFER_SIZE); bytesCopied += bytesRead; } while (bytesRead &gt; 0); Console.WriteLine(bytesCopied); // prints 5000000 } </code></pre> <p>EDIT:</p> <p>I've also (in response to the edited question) now tried uploading the blob using OpenWrite, and the result is the same. (I get the full blob back.) I used this code in place of blob.UploadText(...):</p> <pre><code>using (var input = File.OpenRead(@"testblob.txt")) //5000000 bytes using (var output = blob.OpenWrite()) { input.CopyTo(output); } </code></pre> <p>The final WriteLine still prints 5000000.</p> <p>EDIT 2:</p> <p>This is getting a bit tiresome. Changing the BUFFER_SIZE to 65536 didn't change anything. The results still seem correct to me. Here's my full application for comparison:</p> <pre><code>static void Main(string[] args) { // I also tried a real cloud storage account. Same result. var container = CloudStorageAccount.DevelopmentStorageAccount.CreateCloudBlobClient().GetContainerReference("testcontainer"); container.CreateIfNotExist(); var blob = container.GetBlobReference("testblob.txt"); using (var input = File.OpenRead(@"testblob.txt")) //5000000 bytes using (var output = blob.OpenWrite()) { input.CopyTo(output); } var source = blob.OpenRead(); int BUFFER_SIZE = 65536; byte[] buffer = new byte[BUFFER_SIZE]; int bytesRead; int bytesCopied = 0; do { bytesRead = source.Read(buffer, 0, BUFFER_SIZE); bytesCopied += bytesRead; } while (bytesRead &gt; 0); Console.WriteLine(bytesCopied); // prints 5000000 } </code></pre>
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    1. COI've updated my question after your post. Please see it.
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    2. COyes, it works when we use UploadText method. But when written with OpenWrite method, it reads only 4 mb of data. It seems to be some sort of paging concept.
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    3. COAnswer edited. I still can't reproduce the problem. Can you share a full, functioning program that produces the error?
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