Several ways ...
Firstly I'd make a habit of using ( Referencing ) the Managed DLL's from the ObjectARX SDK
.. located in the ..ObjectARX 20xx\inc-win32 or ..\ObjectARX 20xx\inc-win64 folders.
Once you have referenced them, they are saved under the 'RECENT tab in the AddReferences dialog ... takes about 5 seconds to change them.
Next option would be to open the xxx.csproj file in a text or XML editor
the file references will be found in the section
<ItemGroup>
<Reference Include="acdbmgd"> ....
...
..
</Reference>
Like So
<ItemGroup>
<Reference Include="acdbmgd">
<Name>acdbmgd</Name>
<Private>False</Private>
</Reference>
<Reference Include="acmgd">
<Name>acmgd</Name>
<Private>False</Private>
</Reference>
</ItemGroup>
or So
<ItemGroup>
<Reference Include="AcCui, Version=17.1.0.0, Culture=neutral, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>C:\ACAD2008\AcCui.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="acdbmgd, Version=17.1.0.0, Culture=neutral, processorArchitecture=x86">
<SpecificVersion>False</SpecificVersion>
<HintPath>C:\ACAD2008\acdbmgd.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="AcDx, Version=17.1.0.0, Culture=neutral, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>C:\ACAD2008\AcDx.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="acmgd, Version=17.1.0.0, Culture=neutral, processorArchitecture=x86">
<SpecificVersion>False</SpecificVersion>
<HintPath>C:\ACAD2008\acmgd.dll</HintPath>
<Private>False</Private>
</Reference>
<Reference Include="acmgdinternal, Version=17.1.0.0, Culture=neutral, processorArchitecture=x86">
<SpecificVersion>False</SpecificVersion>
<HintPath>C:\ACAD2008\acmgdinternal.dll</HintPath>
<Private>False</Private>
</Reference>
or so
<ItemGroup>
<Reference Include="AcDbMgd, Version=18.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<Private>False</Private>
</Reference>
<Reference Include="AcMgd, Version=18.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<Private>False</Private>
</Reference>
If you locate one of your own files that work well, simply save the partial section somewhere handy so you can cut and paste into the offending file.
Note : Referencing ALL possible files used will not cause any problems .. the compiler will only read the files it actually needs.
Another option would be to write a custom converter for the XML format *.csproj file. ... lots of conditionals
if the section includes "aDLLName" replace the complete section
.... but it hardly seems worth it when the first option is so speedy.
///kdub