Missing DLLs

05-24-2019 11:43 AM
New Contributor

I'm trying to compile some old code that someone left without documenting -- I had to decompile the exe to get the code. The application is pretty simple and just looks up and geocodes some addresses.

I've installed the ESRI software and the SDK on my local machine, but I still can't find these references:

using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Location;

Does anyone know where they are? What do I need to install? Are these old references that are located in a different dll in the most recent version of the software?

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5 Replies
Esri Contributor

Those are references for the ArcObjects SDK. Did you mean to put this question in that forum?


However, you should be able to add them to your project by right clicking References > Add Reference...

Then select Assemblies > Extensions on the left.

Scroll down and check the boxes for the ESRI.ArcGIS references you need.

Also in case you wanted to know, the ArcGIS Runtime references are:



Regular Contributor

Hi Kimberly,

So what does it mean if you go to "Assemblies - Extensions" and you don't see any esri references listed??  I recently had my PC 'upgraded' to Windows 10, and when I got it back, my ArcObjects SDK is now using my VS 2015 install (instead of my VS 2012).  All of my ArcObjects projects are now complaining of missing references, but I can't seem to figure out how to add them back.

See my post here:  https://community.esri.com/thread/234463-recent-upgrade-to-windows-10-messing-up-visual-studio-proje...

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Esri Frequent Contributor

Adding to Kimberly's post - those dlls are for ArcObjects. If it's a standalone desktop app then most likely it was created with ArcGIS Engine. For more info see http://desktop.arcgis.com/en/quick-start-guides/latest/arcgis-engine-developer-kit-and-engine-quick-....



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New Contributor

Thanks Kimberly, that was really helpful and I found most of them.

I still can't find using ESRI.ArcGIS.esriSystem;

Do you know if that's part of a different SDK?


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Esri Contributor

Hi Christina,

The reference you need in your project for using ESRI.ArcGIS.esriSystem is ESRI.ArcGIS.System.

Hope this helps!



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