<appSettings><add key="AccountName" value="leivms"/><add key="AccountKey" value="storagekey"/><add key="ContainerName" value="vhds"/><add key="VHDName" value="Lei2012CHNVM-Lei2012CHNVM01-2016-01-25.vhd"/></appSettings>

        private string accountname;private string accountkey;private string containername;private void Form1_Load(object sender, EventArgs e){Calculate();}private void Calculate(){var container = GetContainer();var cloudpageblob = container.GetPageBlobReference(ConfigurationManager.AppSettings["VHDName"].ToString());//OutPut VHD Actual Sizestring actualSize = GetFormattedDiskSize(GetActualDiskSize(cloudpageblob));}private CloudBlobContainer GetContainer(){//Get config from Web.Configaccountname = ConfigurationManager.AppSettings["AccountName"].ToString();accountkey = ConfigurationManager.AppSettings["AccountKey"].ToString();containername = ConfigurationManager.AppSettings["ContainerName"].ToString();string connectionString = GenerateConnectionString();//Get Azure Storage Connection String var account = CloudStorageAccount.Parse(connectionString);var client = account.CreateCloudBlobClient();//Get BlobContainer Objectreturn client.GetContainerReference(containername);}private string GenerateConnectionString(){StringBuilder sbuilder = new StringBuilder();sbuilder.Append(@"BlobEndpoint=https://");sbuilder.Append(accountname);sbuilder.Append(".blob.core.chinacloudapi.cn/");sbuilder.Append(@";QueueEndpoint=https://");sbuilder.Append(accountname);sbuilder.Append(".queue.core.chinacloudapi.cn/");sbuilder.Append(@";TableEndpoint=https://");sbuilder.Append(accountname);sbuilder.Append(".table.core.chinacloudapi.cn/");sbuilder.Append(";AccountName=");sbuilder.Append(accountname);sbuilder.Append(";AccountKey=");sbuilder.Append(accountkey);return sbuilder.ToString();}private long GetActualDiskSize(CloudPageBlob pageBlob){pageBlob.FetchAttributes();return 124 + pageBlob.Name.Length * 2+ pageBlob.Metadata.Sum(m => m.Key.Length + m.Value.Length + 3)+ pageBlob.GetPageRanges().Sum(r => 12 + (r.EndOffset - r.StartOffset));}[DllImport("Shlwapi.dll", CharSet = CharSet.Auto)]public static extern long StrFormatByteSize(long fileSize, [MarshalAs(UnmanagedType.LPTStr)] StringBuilder buffer, int bufferSize);public static string GetFormattedDiskSize(long size){var sb = new StringBuilder(11);StrFormatByteSize(size, sb, sb.Capacity);return sb.ToString();}