This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(256, 0%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EH%3C/text%3E%3C/svg%3E)
I upgraded VS from 2019 to 2022. Many projects cannot be loaded.
When I click "Reload Project" for an ASP.Net MVC project
I get the error message "A project with the same name is already opened in the solution"
Could anyone offer a tip on how to remedy this?
A family of Microsoft suites of integrated development tools for building applications for Windows, the web, mobile devices and many other platforms. Miscellaneous topics that do not fit into specific categories.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(240, 8%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESP%3C/text%3E%3C/svg%3E)
For me I got this unhelpful error message when picked up a project I've not used before that hadn't been touched for years and the API wouldn't load saying it was already open in the solution.
I tried removing the .vs , agent ransacking to find the duplicate. I even had a read online as the API name was preferences and i wondered if that was now a standard library. In the end i dropped the API from the main project and loaded that standalone so i could at least get something running.
The result was the API needed IIS setting up for it. Once I'd done so the API would run standalone, i was able to revert the changes in the main project to restore it back in and low! no stupid error message, the project loaded fine.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(54.400000000000006, 39%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESZ%3C/text%3E%3C/svg%3E)
After a long and arduous battle with the VS Gods, here’s what finally worked for me:
bin and obj folders. (I had only been deleting bin before and kept running into the same issue.)bin and obj folders. (I had only been deleting bin before and kept running into the same issue.){Project}.csproj.user file. (Not sure if this was necessary, but I did it during debugging.)![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(64, 0%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMH%3C/text%3E%3C/svg%3E)
I removed 'bin' and 'obj' folder and '{Project}.csproj.user'
Run Visual studio "Run As Administrator".
It works ❤ Thanks.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(54.400000000000006, 80%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EGS%3C/text%3E%3C/svg%3E)
Thanks, Salman; this also worked for me.
Could the project be an older version of MVC? Maybe you need to open the visual studio 2022 installer and install mvc 4 it is under individual components
Thank you for trying to help. I do not see "ASP.NET... prerequisites" but "ASP.NET..." has been installed.
BTW, all is good now after starting VS2022 as administrator. It seems that I always forget this whenever I upgrade VS. I have to go through the awkward hassle to start VS as an administrator automatically. I don't for how long Microsoft will allow this hack to work.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(217.60000000000002, 19%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAP%3C/text%3E%3C/svg%3E)
None of these worked for me. For me the problem was a malformed applicationhost.config. I fixed that and the problem disappeared.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(102.4, 24%, 19%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESJ%3C/text%3E%3C/svg%3E)
Drawing from Phil's comment above regarding it needing an IIS setup, I tried opening VS as Administrator and that worked for me. Strange as this seems to be a new error message.
For me, the problem was caused by a undo change on the .csproj change of IIS Local to IIS Express. The resolution was simple delete the .csproj.user file.