gistfile1.cs

  public string GetCanonicalizedHeaders(HttpWebRequest request)
  {
      ArrayList headerNameList = new ArrayList();
      StringBuilder sb = new StringBuilder();
      foreach (string headerName in request.Headers.Keys)
      {
          if (headerName.ToLowerInvariant().StartsWith("x-ms-", StringComparison.Ordinal))
          {
              headerNameList.Add(headerName.ToLowerInvariant());
          }
      }
      headerNameList.Sort();
      foreach (string headerName in headerNameList)
      {
          StringBuilder builder = new StringBuilder(headerName);
          string separator = ":";
          foreach (string headerValue in GetHeaderValues(request.Headers, headerName))
          {
              string trimmedValue = headerValue.Replace("\r\n", String.Empty);
              builder.Append(separator);
              builder.Append(trimmedValue);
              separator = ",";
          }
          sb.Append(builder.ToString());
          sb.Append("\n");
      }
      return sb.ToString();
  }

gistfile2.cs

private string GetCanonicalizedHeaders(HttpClient httpClient)
{    
    var headers =
        from header in httpClient.DefaultRequestHeaders
        where header.Key.StartsWith("x-ms-", StringComparison.InvariantCultureIgnoreCase)
        orderby header.Key
        select new
        {
            Key = header.Key,
            Values = header.Value.Select(value => value.Replace(Environment.Newline, ""))
        };
        
    var headerText = new StringBuilder();
    
    foreach(var header in headers)
    {
        headerText.Append(header.Key);
        
        var separator = ":";

        foreach(var value in header.Values)
        {
            builder.Append(separator).Append(value);
            
            separator = ",";
        }

        headerText.AppendLine();
    }

    return headerText.ToString();
}