# Problems with C# OpenCV application
**URL:** https://forum.opencv.org/t/problems-with-c-opencv-application/683
**Category:** Uncategorized
**Created:** [January 5, 2021, 8:28pm UTC](https://forum.opencv.org/t/problems-with-c-opencv-application/683 "2021-01-05T20:28:35Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@nikjoorobert](https://forum.opencv.org/u/nikjoorobert)
#### Post date: [January 5, 2021, 8:28pm UTC](https://forum.opencv.org/t/problems-with-c-opencv-application/683/1 "2021-01-05T20:28:35Z")
Hi, I have a serious problem. If anyone can help I will be grateful.
I have developed 5 applications to put on my site for clients to view. I used the release edition of VS to produce them.
3 of them work okay. The two that dont work properly – I had to bring in an outside library (OpenCV) so they could be used. In the realise directory of these apps the OpenCV dlls were present.
What am I doing wrong? The above two applications simply fail when I download and activate them. They work no problems when in their initial release and debug directories.
---
### Author:  [@crackwitz](https://forum.opencv.org/u/crackwitz)
#### Post date: [January 6, 2021, 7:29am UTC](https://forum.opencv.org/t/problems-with-c-opencv-application/683/2 "2021-01-06T07:29:26Z")
you need to distribute all required DLLs.
use Dependency Walker to investigate what DLLs you are missing:
> **[Dependency Walker (depends.exe) Home Page](https://www.dependencywalker.com/)**