We are using our barcode reader of pdf file but it not work

Here is an alternative solution:

 

Step 1: convert PDF to indivdual images using Spire.PDF

 

https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Convert-PDF-Page-to-Image-with-C-code.html

 

Step 2: scan image using Spire.Barcode

https://www.e-iceblue.com/Tutorials/Spire.Barcode/Spire.Barcode-Program-Guide/How-to-Scan-Barcode-in-C.html

Hi.

The error is saying that, the parameter memStream which you are passing inside FromStream is invalid. So in FromStream method first check what value it is expecting and based on that pass value in it.

Thanks.