When saving workbook as Html to HttpContext in Aspose.Cellsfor .net, and setting ContentDisposition to “Inline”, it is still sent as an attachment. This appears to be because the content type header is still set to “application/vnd.ms-excel” even though it’s saved as Html.
Could you create a standalone sample VS.NET project to demonstrate the issue you are talking about, we need to evaluate your code a bit. Please zip the project and attach it here, we will check it soon.