# .net API version 28.0.0

**URL:** <https://developer.squareup.com/forums/t/net-api-version-28-0-0/9743>\
**Category:** Questions\
**Tags:** customers-api\
**Created:** [June 13, 2023, 10:23am UTC](https://developer.squareup.com/forums/t/net-api-version-28-0-0/9743 "2023-06-13T10:23:26Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![pauld](https://avatars.discourse-cdn.com/v4/letter/p/958977/32.png) [@pauld](https://developer.squareup.com/forums/u/pauld)\
**Post date:** [August 16, 2023, 6:13pm UTC](https://developer.squareup.com/forums/t/net-api-version-28-0-0/9743/8 "2023-08-16T18:13:46Z")

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Hi @Bryan-Square we are still experiencing the same issue, upgrading from 25.1.0 to 26.0.0 and above, any call to Square freezes/locks IIS and VS.  
I can create a completely blank web project with nothing in it except the Square API, debug the application in localhost, make any call to Square and it freezes.  
If I use a Windows Console Application upgrading from 25.1.0 to 26.0.0 and above it works correctly so suggests this is some issue running the API on a local web server.  
Just an assumption but the library APIMatic.Core was used in the upgrade from 25.1.0 to 26.0.0, could it be something to do with this library?

I also added this comment to the thread here that appeared to be having the same issue:

> [@.NET SDK v25.2.0 and 26.0.0 freeze/lock IIS/VS](https://developer.squareup.com/forums/t/net-sdk-v25-2-0-and-26-0-0-freeze-lock-iis-vs/9467/16):
>
> Here is the list of all packages: Id Version Antlr 3.5.0.2 APIMatic.Core 0.2.6 BarcodeLib 3.0.0 bootstrap 5.3.0 BouncyCastle.Cryptography 2.2.1 EntityFramework 6.4.4 jQuery 3.7…

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