I tried to replicate the reported problem by creating a simple page of WebFileUploader based on the given snippet code and deploy it to IIS. Next, an excel file (with .xlsx file format) is uploaded using the WebFileUploader. Everything worked smoothly and the uploaded file can be accessed without any issues.

For your information, I'm using the same version of WebTextEditor (WebTextEditor 2 build 5) and WebUI.NET Framework 3.

I enclosed the original file of my xlsx file as attachment. Please try to upload this file on your remote web server and let me know whether the problem still persist or not.

Hi Yudi,

Thank you for you reply.

I have use of your excel file to test, there are still problems.

Please note that our web server operation system is : Windows Server 2012 R2 Standard, IIS Version is : IIS 8.5.9600.16384.

Can you help look for the cause, thank you.

I re-test my sample on web server with following specification:

• IIS 8.5.9600.16384 running on Windows 8.1
• Application pool: DefaultAppPool (.NET CLR Version v4.0.30319 with Integrated pipeline mode)
• WebUI.NET Framework 3.0 build 931
• WebTextEditor 2 build 5

However, I was unable to reproduce the problem using Northwind3.xlsx file.
Please feel free to let me know if you find anything that I might miss during my attempt to reproduce the problem.

Note: If necessary, I could provide you with the simple sample project.

Hi Yudi,

Sorry for reply to you. There are still problems. 

The previous analysis may be wrong，Maybe it doesn't matter with the operating system and IIS.

I discover the Following problem is:

  1.It can be successful upload, but the file can't open after upload

  2.whether it is XLS or.Xlsx formats have problems

  3.not every upload all have problems, sometimes successfully, sometimes failure

  4. repeat upload more than 10 times

  5. debug source code have error, see picture 'Debug.png'

I have attached some of my project files to you, to help create a VB project, and then test the upload task.

If there are other need to configure the place, please explain, thank you.

Hi Yudi

Any news?