Visual studio 2012 showing duplicate dlls in reference manager - visual-studio-2012

In a website project, when I press add reference. All build in assemblies in .net are showing twice, and when adding one it also adds the other and fails the add.

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Could not find type 'Microsoft.Office.Tools.Ribbon.RibbonTab' error prevents designer from opening

I have a VSTO for Excel project with a custom ribbon tab. The solution builds without errors. I can run the solution. It launches Excel and displays the custom ribbon tab and task pane without any issue.
When I try to open the designer for the custom ribbon tab in Visual Studio 2019, I get the following error:
Could not find type 'Microsoft.Office.Tools.Ribbon.RibbonTab'. Please
make sure the assembly that contains this type is referenced. If this
type is a part of a development project, make sure that the project
has been successfully built using the settings for your current
platform or Any CPU.
The solution builds and runs without any issues.
When I expand the error info, There is no stack trace or error line information available for this error.
The build settings are set to 'Any CPU'.
The assemblies that contain 'Microsoft.Office.Tools.Ribbon.RibbonTab' are included in the project references. These are Microsoft.Office.Tools.Common and Microsoft.Office.Tools.Common.v4.0.Utilities.
I have tried to Clean, Rebuild, and Restart Visual Studio 2019. This had no effect.
I could not find anything definitive when I Check Windows Forms Design-Time error list.
Would anyone know how to address this issue so that I can open the custom ribbon in the designer?
Is VSTO still supported by Microsoft? All documentation appears to be several years old.
This is a Visual Studio issue, not a C#/Build/DLL linkage issue.
Make sure your Visual Studio setup (do the Modify in the installer (#1) if already installed) has these two components checked:
Is VSTO still supported by Microsoft?
They are moving to an online office365 addin (my words) type VSTO. As to new features, not recently. One can still put in a Visual Studio support ticket if you have the right subscription.
I have never had any issues with ribbons, but sometimes the winforms res files in designer do not show and I use the JetBrains Rider editor to view those controls when VS fails.

Cannot find C++ project templates after installing Visual Studio 2015

After installing Visual Studio 2015, when I go to File -> New Project, I cannot find any project templates related to Visual C++. How can I get them?
You can do that by modifying the Visual Studio, and you can do that using these steps:
Go to Control panel
In the Add or Remove Programs dialog box, select the product you want to repair and then click Change/Remove
In the Setup wizard, click Next
Click Repair
Then Modify - now you can select C++ to add it.
Visual Studio 2015 has made a number of setup components optional. This means that the default installation set is very small and the user can select any additional components he wants to install. Visual C++ is one of the optional install components.
Most of the optional install components can also be acquired through regular product work-flows. For example, when you go to File -> New Project dialog and are not able to find any Visual C++ templates, you will at least see an item that allows you to acquire Visual C++ tools. It does this by launching the setup experience with the "Visual C++" tools pre-selected.
For more information, please see this link:
http://blogs.msdn.com/b/vcblog/archive/2015/07/24/setup-changes-in-visual-studio-2015-affecting-c-developers.aspx
You can add the missing templates by:
Go to File(in visual studio).
Select New project.
Under Templates Select Open Visual Studio Installer.
Now you can add any component.
Works on Visual Studio 2017.
Don't know about others.
If you have an MSVS update 3 installed then you may have face with one of the problem of this update. See more here Visual Studio 2015 Update 3 Known Issues. Here is a quote from this document
In some cases, applying Update 3 can cause the optional feature selections for Visual C++ (e.g. Common Tools for Visual C++ 2015) to become deselected and uninstalled.

Visual Studio 2012 Add New Class Missing Template

I've just installed VS2012 Ultimate side by side with VS2010 and it seems the standard templates are broken. I cannot add a class nor a console application.
File > New > File dialog contains the "Visual C# Class" template
but Right Click Project > Add > Class dialog does not contain the "Visual C# Class" template
Also File > New Project only contains MVC4 and not things like Console Application even if I change framework version and left filter.
EDIT: This only occurs after installing update 1. We have tried reinstalling, repairing, deleting the templates cache and reinstalling templates. We're considering working without update 1 at the moment, but there doesn't seem to be a way to uninstall just the update.
Corrupted ISO supplied, tried another from msdn and all fine now.

Unable to edit Orchard CMS site in Visual Studio 2012

I'm trying to create a site using Orchard CMS. To get started, I downloaded / installed Orchard from WebMatrix. I successfully setup a site using the "Default" recipe. I then click the "Files" tab within the accordian along the left side. From here, I can see all of the files in my project. To begin editing within Visual Studio 2012, I click the "Visual Studio" button in the ribbon.
Once inside Visual Studio, I right-click on the solution and select "Rebuild Solution". The solution begins building, but then I receive an error. The error says:
Error 1 Object reference not set to an instance of an object. C:\Users\username\Documents\My Web Sites\Orchard CMS2\Modules\Contrib.Cache\Contrib.Cache.csproj 1
Please note that at this point, I have not even edited a single file. Rather, I created a basic site and attempted to open it in Visual Studio. What am I doing wrong?
Only the full source code will build in Visual Studio. You can edit the compiled web site version that you downloaded in Visual Studio, but you won't be able to build it. It actually doesn't need building as it has dynamic compilation built-in.
If you want to build the framework and core, get the full source code version.

Visual Studio 2012 Windows service .vdproj project migration

I'm trying to move a solution I have over to Visual Studio 2012 and one of the project types is .vdproj.
According to this link this project type is not supported in Visual Studio 2012:
MSDN says they recommend that you use InstallShield Limited Edition for Visual Studio.
The problem is, when I open up my solution in VS2012 and try to add a new "Enable InstallShield Limited Edition" project to my solution, I get an error message saying:
Creating project 'test'...project creation failed.
Why might I not be able to add a project of this type to my solution?
If I make a new empty solution I can't make an InstallShield project it in either.
I'm going to try to download InstallShield limited edition and see if it does anything.
I tried out that InstallShield download, and it added two extra project types, but I'm unable to create either of them. I'm able to add normal website projects to my solutions just fine, but not deployment projects.
The installer was named the same, but this one prompted me to re-start. After re-starting I was able to add an InstallShield project, but it gets created in its own solution. So, it looks like now I have to figure out how to use it, and I'll be good to go.
It's looking like the limited edition doesn't have support to install Windows services.
This will probably be long and boring because there's lots of steps, but I'd like to write up how to move from a Windows service installer .vdproj to the new InstallShield LE that's available in Visual Studio 2012.
Step 1: Create a merge module (.msm)
Follow the steps of this guide.
Notes:
You will need to install WiX 3.6 and isWiX
The latest release of IsWiX doesn't enable the Tools menu item in Visual Studio 2012. Edit the file: C:\ProgramData\Microsoft\MSEnvShared\AddIns\IsWiXAddin.Addin (XML) and clone the HostApplication element and update 10.0 to 11.0.
In step #8 of the guide, it references a code tab. This has been moved to the XML Editor item in the bottom of the left menu
I left the MergeRedirectFolder empty for my installation
Here is my isWix files view:
After you're done with the guide you should have an empty .wxs file that looks something like this:
Using the Component XML element pulled from here you should end up with a .wxs file that looks like this:
Hit build and you should now have a .msm file.
Step 2: Adding merge module to InstallShield
Go though the wizard to setup the basic install information like company and version information.
Find the redistributables view in ISLE. Right click the list and select browse for module. After your module is found and added, right click the modules and select properties. Set the destination folder drop down to INSTALLDIR. I had to set mine to the lowest level folder I created for my install path, so you might have to experiment a bit.
Build Project, and test on virtual machine
Redistributables Screen
If you're getting errors about the path being too long you might need to change the release location to something close to the root.
Here's a list of all the build errors for reference.
Now you should be able to run your installer and have it install/start a Windows service. A lot more work than .MSI files, we got it to generate in Visual Studio 2010, but overall it was not too bad.
While there is no easy or truly supported solution for Visual Studio 2012, Visual Studio 2013 users can get an extension from Microsoft in the Visual Studio Gallery.
I found this post which says you must download InstallShield first. It's a very confusing way to work. I suggest to vote up the post on the connect site and give them comments letting know how poor that is. They could at least give a more descriptive error http://connect.microsoft.com/VisualStudio/feedback/details/732196/project-creation-failed-for-installshield-limited-edition#tabs

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